General Science MCQs
Q 1.After whom is the chemical element with atomic number 102 named?
Answer: Correct Answer:C [Alfred Bernhard Nobel]
Notes: Alfred Bernhard Nobel was a Swedish chemist, engineer, inventor, businessman, and philanthropist. Atomic number 102 was named after him.
Notes: Alfred Bernhard Nobel was a Swedish chemist, engineer, inventor, businessman, and philanthropist. Atomic number 102 was named after him.
Q 2.Which of the following makes the skin layer impervious to water?
Answer: Correct Answer:C [Keratin]
Notes: Keratin is a family of fibrous structural proteins involved in making up the outer layer of human skin. It is also the key structural component of hair and nails. Cells in the epidermis contain a structural matrix of keratin, which makes this outermost layer of the skin almost waterproof, and along with collagen and elastin, gives skin its strength. It also makes up fish scales and crustacean shells, bird feathers and beaks, animal horns and hooves.
Notes: Keratin is a family of fibrous structural proteins involved in making up the outer layer of human skin. It is also the key structural component of hair and nails. Cells in the epidermis contain a structural matrix of keratin, which makes this outermost layer of the skin almost waterproof, and along with collagen and elastin, gives skin its strength. It also makes up fish scales and crustacean shells, bird feathers and beaks, animal horns and hooves.
Q 3.Epidermal cells of which part of plant often secrete a waxy water resistant layer on their outer surface?
Answer: Correct Answer:A [Aerial parts only]
Notes: The major role of epidermis is to protect all the parts of the plant. Epidermal cells on the aerial parts of the plant often secrete a waxy, water-resistant layer on their outer surface. This aids in protection against loss of water, mechanical injury and invasion by parasitic fungi.
Notes: The major role of epidermis is to protect all the parts of the plant. Epidermal cells on the aerial parts of the plant often secrete a waxy, water-resistant layer on their outer surface. This aids in protection against loss of water, mechanical injury and invasion by parasitic fungi.
Q 4.Membrane lipids of chillsensitive plants contain ____:
Answer: Correct Answer:D [High proportion of unsaturated fatty acids]
Notes: The membranes of chill sensitive plants have about a 2 :1 ratio of unsaturated to saturated fatty acids. It has been seen that the proportion of unsaturated membrane fatty acids increases and the critical temperature decreases so that chill-sensitive plants are more acclimitized to low temperatures.
Notes: The membranes of chill sensitive plants have about a 2 :1 ratio of unsaturated to saturated fatty acids. It has been seen that the proportion of unsaturated membrane fatty acids increases and the critical temperature decreases so that chill-sensitive plants are more acclimitized to low temperatures.
Q 5.In coriander, the useful parts are____:
Answer: Correct Answer:D [Leaves & dried fruits]
Notes: Coriander (Coriandrum sativum), also known as cilantro, Chinese parsley or dhania, is an annual herb in the family Apiaceae. All parts of the plant are edible, but the fresh leaves and the dried seeds are the parts most traditionally used in cooking.
Notes: Coriander (Coriandrum sativum), also known as cilantro, Chinese parsley or dhania, is an annual herb in the family Apiaceae. All parts of the plant are edible, but the fresh leaves and the dried seeds are the parts most traditionally used in cooking.
Q 6.What is commonly known as white plague?
Answer: Correct Answer:C [Tuberculosis]
Notes: Tuberculosis caused by Mycobacterium tuberculie which primarily affects lungs although can affect other body too while early 19th century was called ‘white plague’ because of the large number of the people dying of its infection.
Notes: Tuberculosis caused by Mycobacterium tuberculie which primarily affects lungs although can affect other body too while early 19th century was called ‘white plague’ because of the large number of the people dying of its infection.
Q 7.The vitamin which is very labile and easily destroyed during cooking as well as storage is vitamin ____:
Answer: Correct Answer:B [Vitamin C]
Notes: Vitamin C is quite unstable when cooked or stored improperly. It is very liable and easily destroyed during cooking as well as storage. It is a water-soluble and temperature-sensitive vitamin, so is easily degraded during cooking, and elevated temperatures and long cooking times have been found to cause particularly severe losses of vitamin C.
Notes: Vitamin C is quite unstable when cooked or stored improperly. It is very liable and easily destroyed during cooking as well as storage. It is a water-soluble and temperature-sensitive vitamin, so is easily degraded during cooking, and elevated temperatures and long cooking times have been found to cause particularly severe losses of vitamin C.
Q 8.The colour change in the Chameleon is due to the presence of ____:
Answer: Correct Answer:A [Chromatophore]
Notes: Chameleons have specialized cells, chromatophores, which contain pigments in their cytoplasm, in three layers below their transparent outer skin. Dispersion of the pigment granules in the chromatophores sets the intensity of each color. Chromatophores contain pigments and reflect light, which are responsible for creating coloration. In chameleons, there are four types of chromatophores: xanthophores, erythrophores, iridiophores, and melanophores (Cooper and Greenberg, 1992).
Notes: Chameleons have specialized cells, chromatophores, which contain pigments in their cytoplasm, in three layers below their transparent outer skin. Dispersion of the pigment granules in the chromatophores sets the intensity of each color. Chromatophores contain pigments and reflect light, which are responsible for creating coloration. In chameleons, there are four types of chromatophores: xanthophores, erythrophores, iridiophores, and melanophores (Cooper and Greenberg, 1992).
Q 9.Which of the following statement is incorrect?
Answer: Correct Answer:B [Hydra have only a sexual reproduction]
Notes: Hydra is radially symmetrical, that is, the parts of its body are arranged in a circle around a central median axis passing through the mouth. Hydra reproduces by asexual and sexual methods. Asexual reproduction takes place either by budding or by fission.
Notes: Hydra is radially symmetrical, that is, the parts of its body are arranged in a circle around a central median axis passing through the mouth. Hydra reproduces by asexual and sexual methods. Asexual reproduction takes place either by budding or by fission.
Q 10.The disease which has been eradicated ____:
Answer: Correct Answer:B [Small pox]
Notes: Smallpox was an infectious disease caused by either of two virus variants, Variola major and Variola minor. After vaccination campaigns throughout the 19th and 20th centuries, the WHO certified the global eradication of smallpox in 1979. Smallpox is one of two infectious diseases to have been eradicated, the other being Rinderpest.
Notes: Smallpox was an infectious disease caused by either of two virus variants, Variola major and Variola minor. After vaccination campaigns throughout the 19th and 20th centuries, the WHO certified the global eradication of smallpox in 1979. Smallpox is one of two infectious diseases to have been eradicated, the other being Rinderpest.
Q 11.The cells which are colsely associated and interacting with guard cells are ____:
Answer: Correct Answer:C [Subsidiary cells]
Notes: Guard cells interact physiologically and mechanically with subsidiary cells. Guard cells are those which have chloroplasts and control the opening of stomata. But, subsidiary cells are those which support the guard cells and they do not have chloroplasts.
Notes: Guard cells interact physiologically and mechanically with subsidiary cells. Guard cells are those which have chloroplasts and control the opening of stomata. But, subsidiary cells are those which support the guard cells and they do not have chloroplasts.
Q 12.Green manure is obtained from ___:
Answer: Correct Answer:B [Decomposing green legume plants]
Notes: Green undecomposed material used as manure is called green manure. It is obtained in two ways: by growing green manure crops or by collecting green leaf (along with twigs) from plants grown in wastelands, field bunds and forest.
Notes: Green undecomposed material used as manure is called green manure. It is obtained in two ways: by growing green manure crops or by collecting green leaf (along with twigs) from plants grown in wastelands, field bunds and forest.
Q 13.In India and elsewhere, biomass can be obtained from ____:
Answer: Correct Answer:D [All of the above ]
Notes: Biomass most often refers to plants or plant-based materials that are not used for food or feed, but as energy source. Biomass fuels come from things that once lived: wood products, dried vegetation, crop residues, aquatic plants and even garbage. It is known as ‘Natural Material’. As an energy source, biomass can either be used directly via combustion to produce heat, or indirectly after converting it to various forms of biofuel.
Notes: Biomass most often refers to plants or plant-based materials that are not used for food or feed, but as energy source. Biomass fuels come from things that once lived: wood products, dried vegetation, crop residues, aquatic plants and even garbage. It is known as ‘Natural Material’. As an energy source, biomass can either be used directly via combustion to produce heat, or indirectly after converting it to various forms of biofuel.
Q 14.Which blood group individuals are universally known as recipients because they can receive blood from any group?
Answer: Correct Answer:D [Group AB]
Notes: Blood group AB individuals are universally known as recipients because they can receive blood from any group, this is due to the presence of both A and B antigens on the surface of their RBC’s and an absence of antibodies against either A or B antigen in the plasma. However, they can only donate blood to individuals of the same AB blood group.
Notes: Blood group AB individuals are universally known as recipients because they can receive blood from any group, this is due to the presence of both A and B antigens on the surface of their RBC’s and an absence of antibodies against either A or B antigen in the plasma. However, they can only donate blood to individuals of the same AB blood group.
Q 15.What are Lipids?
Answer: Correct Answer:D [Cholesterol and trans fatty acids are types of Lipids]
Notes: Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterolcontaining metabolites such as cholesterol.
Notes: Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterolcontaining metabolites such as cholesterol.
Q 16.Normally how many times the human heart beats in a minute?
Answer: Correct Answer:A [72]
Notes: Heart rate is the speed of the heartbeat measured by the number of contractions of the heart per minute (bpm). Conventionally, a normal adult has a heartbeat rate of 72 per minute. However, the heart rate can vary according to the body’s physical needs, including the need to absorb oxygen and excrete carbon dioxide.
Notes: Heart rate is the speed of the heartbeat measured by the number of contractions of the heart per minute (bpm). Conventionally, a normal adult has a heartbeat rate of 72 per minute. However, the heart rate can vary according to the body’s physical needs, including the need to absorb oxygen and excrete carbon dioxide.
Q 17.Syrinx is the voice box in ____:
Answer: Correct Answer:A [Birds]
Notes: Syrinx is the name for the vocal organ of birds. Located at the base of a bird’s trachea, it produces sounds without the vocal cords of mammals. The sound is produced by vibrations of some or all of the membrana tympaniformis (the walls of the syrinx) and the pessulus caused by air flowing through the syrinx.
Notes: Syrinx is the name for the vocal organ of birds. Located at the base of a bird’s trachea, it produces sounds without the vocal cords of mammals. The sound is produced by vibrations of some or all of the membrana tympaniformis (the walls of the syrinx) and the pessulus caused by air flowing through the syrinx.
Q 18.Lymph carries digested and absorbed fat from ____:
Answer: Correct Answer:D [Intestine]
Notes: Lymphatic system carries out the absorption of fats and fat-soluble vitamins from the digestive system and the subsequent transport of these substances to the venous circulation. Lymphatic vessels present in the intestinal villi absorb fatty acids and carries the digested food and fats from the small intestine. It acts as a reservoir of digested food and water.
Notes: Lymphatic system carries out the absorption of fats and fat-soluble vitamins from the digestive system and the subsequent transport of these substances to the venous circulation. Lymphatic vessels present in the intestinal villi absorb fatty acids and carries the digested food and fats from the small intestine. It acts as a reservoir of digested food and water.
Q 19.Biodegradable wastes can usually be converted into useful substances with the help of ____:
Answer: Correct Answer:B [Bacteria]
Notes: By far the most important microscopic decomposers are bacteria, which do the lion’s share of decomposition in the compost heap. The microbial organisms transform the substance through metabolic or enzymatic processes. It is based on two processes: growth and cometabolism. In growth, an organic pollutant is used as sole source of carbon and energy. This process results in a complete degradation (mineralization) of organic pollutants. But there are other microscopic creatures such as actinomycetes, fungi, and protozoa, that also play an important role.
Notes: By far the most important microscopic decomposers are bacteria, which do the lion’s share of decomposition in the compost heap. The microbial organisms transform the substance through metabolic or enzymatic processes. It is based on two processes: growth and cometabolism. In growth, an organic pollutant is used as sole source of carbon and energy. This process results in a complete degradation (mineralization) of organic pollutants. But there are other microscopic creatures such as actinomycetes, fungi, and protozoa, that also play an important role.
Q 20.The least penetrating power ray is ____:
Answer: Correct Answer:B [Alpha-Ray]
Notes: Alpha-rays have high ionizing power but it is difficult for them to penetrate matter thoroughly. This is because alpha particles are likely to ionize the first thing they come into contact with; thus, they hold a small range of penetrating power. Beta rays have intermediate; while, Gamma Rays and X-Rays have maximum penetrating power.
Notes: Alpha-rays have high ionizing power but it is difficult for them to penetrate matter thoroughly. This is because alpha particles are likely to ionize the first thing they come into contact with; thus, they hold a small range of penetrating power. Beta rays have intermediate; while, Gamma Rays and X-Rays have maximum penetrating power.
Q 21.Which blood group individuals are universally known as recipients because they can receive blood from any group?
Answer: Correct Answer:D [Group AB]
Notes: Blood group AB individuals are universally known as recipients because they can receive blood from any group, this is due to the presence of both A and B antigens on the surface of their RBC’s and an absence of antibodies against either A or B antigen in the plasma. However, they can only donate blood to individuals of the same AB blood group.
Notes: Blood group AB individuals are universally known as recipients because they can receive blood from any group, this is due to the presence of both A and B antigens on the surface of their RBC’s and an absence of antibodies against either A or B antigen in the plasma. However, they can only donate blood to individuals of the same AB blood group.
Q 22.The metal ion present in vitamin B12 is ____:
Answer: Correct Answer:C [Cobalt]
Notes: The structure of B12 is based on a corrin ring, which is similar to the porphyrin ring found in heme, chlorophyll, and cytochrome. It contains the biochemically rare element cobalt sitting in the centre of the ring. Also called cobalamin, it is a water-soluble vitamin.
Notes: The structure of B12 is based on a corrin ring, which is similar to the porphyrin ring found in heme, chlorophyll, and cytochrome. It contains the biochemically rare element cobalt sitting in the centre of the ring. Also called cobalamin, it is a water-soluble vitamin.
Q 23.Which is the largest blood vessel in human body?
Answer: Correct Answer:B [Aorta]
Notes: Aorta is the largest blood vessel in human body. It is the largest of the systemic circulation arteries. Blood enters the aorta from the left ventricle of the heart by way of a one-way valve to prevent backflow. From the aorta, several arterial branches carry oxygenated blood under pressure to all tissues in the body.
Notes: Aorta is the largest blood vessel in human body. It is the largest of the systemic circulation arteries. Blood enters the aorta from the left ventricle of the heart by way of a one-way valve to prevent backflow. From the aorta, several arterial branches carry oxygenated blood under pressure to all tissues in the body.
Q 24.The presence of air bubble in blood stream is dangerous to life because _____:
Answer: Correct Answer:A [The flow of blood is obstructed]
Notes: The presence of air bubble in blood, known as air embolism, occludes blood vessels. The flow of blood is obstructed causing strokes, heart attacks, pulmonary complications. An arterial air embolism is far more dangerous than a venous embolism since it prevents oxygenated blood from reaching the target organ and cause ischemia. It can even lead to heart attack or stroke leading to death.
Notes: The presence of air bubble in blood, known as air embolism, occludes blood vessels. The flow of blood is obstructed causing strokes, heart attacks, pulmonary complications. An arterial air embolism is far more dangerous than a venous embolism since it prevents oxygenated blood from reaching the target organ and cause ischemia. It can even lead to heart attack or stroke leading to death.
Q 25.Which of the following transports water from the roots of the plant to its leaves?
Answer: Correct Answer:D [Both xylem and phloem]
Notes: Plants have two different types of ‘transport’ tissue. Xylem transports water and solutes from the roots to the leaves, phloem transports food from the leaves to the rest of the plant. Comparison of xylem and phloem Tissue Process What is moved Structure Xylem Transpiration Moves water Columns of hollow, and minerals dead reinforced cells from roots to leaves Phloem Translocation Moves food Columns of substances from living cells leave to rest of plant.
Notes: Plants have two different types of ‘transport’ tissue. Xylem transports water and solutes from the roots to the leaves, phloem transports food from the leaves to the rest of the plant. Comparison of xylem and phloem Tissue Process What is moved Structure Xylem Transpiration Moves water Columns of hollow, and minerals dead reinforced cells from roots to leaves Phloem Translocation Moves food Columns of substances from living cells leave to rest of plant.
Q 26.Interferons are synthesized in response to ____:
Answer: Correct Answer:A [Virus]
Notes: Interferons (IFNs) are a group of signaling proteins made and released by host cells in response to the presence of pathogens, such as viruses, bacteria, parasites, or tumor cells. Interferon synthesis occurs primarily in response to viral single-stranded or double stranded RNA that are either the genetic material of RNA viruses or a product of viral transcription. Interferons are named for their ability to “interfere” with viral replication by protecting cells from virus infections.
Notes: Interferons (IFNs) are a group of signaling proteins made and released by host cells in response to the presence of pathogens, such as viruses, bacteria, parasites, or tumor cells. Interferon synthesis occurs primarily in response to viral single-stranded or double stranded RNA that are either the genetic material of RNA viruses or a product of viral transcription. Interferons are named for their ability to “interfere” with viral replication by protecting cells from virus infections.
Q 27.Which amongst the following is the largest mammal?
Answer: Correct Answer:C [Whale]
Notes: Blue whales are the largest animals ever known to have lived on Earth. These magnificent marine mammals rule the oceans at up to 100 feet (30 meters) long and upwards of 200 tons (181 metric tons). Their tongues alone can weigh as much as an elephant. Their hearts, as much as an automobile. Blue whales reach these mind-boggling dimensions on a diet composed nearly exclusively of tiny shrimplike animals called krill. During certain times of the year, a single adult blue whale consumes about 4 tons (3.6 metric tons) of krill a day.
Notes: Blue whales are the largest animals ever known to have lived on Earth. These magnificent marine mammals rule the oceans at up to 100 feet (30 meters) long and upwards of 200 tons (181 metric tons). Their tongues alone can weigh as much as an elephant. Their hearts, as much as an automobile. Blue whales reach these mind-boggling dimensions on a diet composed nearly exclusively of tiny shrimplike animals called krill. During certain times of the year, a single adult blue whale consumes about 4 tons (3.6 metric tons) of krill a day.
Q 28.Insectivorous plants grow in soil deficient in ____:
Answer: Correct Answer:B [Nitrogen]
Notes: Insectivorous plants grow in soil deficient in nitrogen. In general, plants absorb nitrogen and phosphorus from the soil through their roots. Insectivorous plants, however, absorb nitrogen and phosphorus from their animal prey through their leaves specially modified as traps. They trap insects, kill them and then absorb nitrogen from their dead decomposing body.
Notes: Insectivorous plants grow in soil deficient in nitrogen. In general, plants absorb nitrogen and phosphorus from the soil through their roots. Insectivorous plants, however, absorb nitrogen and phosphorus from their animal prey through their leaves specially modified as traps. They trap insects, kill them and then absorb nitrogen from their dead decomposing body.
Q 29.Who discovered that Malaria was caused by female Anopheles?
Answer: Correct Answer:D [Ronald Ross]
Notes: Edward Jenner of Britain discovered vaccination in 1796. Louis Pasteur of France discovered Rabies vaccine in 1860. Robert Koch of Germany discovered Cholera and TB germs in 1877. Sir Ronald Ross was a British Physician and entomologist, noted for identifying the links between mosquitoes and malaria. He was born in India in 1857 at Almora.
Notes: Edward Jenner of Britain discovered vaccination in 1796. Louis Pasteur of France discovered Rabies vaccine in 1860. Robert Koch of Germany discovered Cholera and TB germs in 1877. Sir Ronald Ross was a British Physician and entomologist, noted for identifying the links between mosquitoes and malaria. He was born in India in 1857 at Almora.
Q 30.The process of imbibition involves ____:
Answer: Correct Answer:C [Absorption]
Notes: The uptake or absorption of water by the solid substance without forming a solution is called imbibition. The substances absorbing water are called imbibants which do not dissolve in water. It is the initial step in the germination of the seeds. The swelling of upper surface of plywood immersed in water is also an example imbibition. It’s like adsorption.
Notes: The uptake or absorption of water by the solid substance without forming a solution is called imbibition. The substances absorbing water are called imbibants which do not dissolve in water. It is the initial step in the germination of the seeds. The swelling of upper surface of plywood immersed in water is also an example imbibition. It’s like adsorption.
Q 31.Hepatitis is caused by _____:
Answer: Correct Answer:D [Virus]
Notes: Hepatitis is an inflammation of the liver. Viruses cause most cases of hepatitis. There are 5 main hepatitis viruses, referred to as types A, B, C, D and E. The type of hepatitis is named for the virus that causes it; for example, hepatitis A, hepatitis B or hepatitis C. Drug or alcohol use can also cause hepatitis.
Notes: Hepatitis is an inflammation of the liver. Viruses cause most cases of hepatitis. There are 5 main hepatitis viruses, referred to as types A, B, C, D and E. The type of hepatitis is named for the virus that causes it; for example, hepatitis A, hepatitis B or hepatitis C. Drug or alcohol use can also cause hepatitis.
Q 32.Honey that has high concentration of sugar does not decay because _____:
Answer: Correct Answer:C [Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out]
Notes: The reason why bacteria does not grow in high concentration of sugar is because of sugar’s high osmotic and dehydrating effects. Sugar, in aqueous form, attempts to reach equilibrium with the sugar content of the food product with which it is in contact. This has the effect of drawing available water from within the food to the outside and inserting sugar molecules into the food interior. The result is a reduction of the so-called product water activity, a measure of unbound, free water molecules in the food that is necessary for microbial survival and growth. Sugar’s other antimicrobial mechanisms include interference with a microbe’s enzyme activity.
Notes: The reason why bacteria does not grow in high concentration of sugar is because of sugar’s high osmotic and dehydrating effects. Sugar, in aqueous form, attempts to reach equilibrium with the sugar content of the food product with which it is in contact. This has the effect of drawing available water from within the food to the outside and inserting sugar molecules into the food interior. The result is a reduction of the so-called product water activity, a measure of unbound, free water molecules in the food that is necessary for microbial survival and growth. Sugar’s other antimicrobial mechanisms include interference with a microbe’s enzyme activity.
Q 33.Hydrogen peroxide is an effective sterilizing agent. Which one of the following product results when it readily loses active oxygen?
Answer: Correct Answer:D [Water]
Notes: Hydrogen peroxide (H2O2) is a water molecule with an extra oxygen atom hence, also called oxygenated water. It is very unstable and breaks down readily into water and a single oxygen molecule. So in nutshell, when Hydrogen peroxide readily loses active oxygen, Water is formed.2H2O2 —> 2H2O + O2
Notes: Hydrogen peroxide (H2O2) is a water molecule with an extra oxygen atom hence, also called oxygenated water. It is very unstable and breaks down readily into water and a single oxygen molecule. So in nutshell, when Hydrogen peroxide readily loses active oxygen, Water is formed.2H2O2 —> 2H2O + O2
Q 34.Methane contributes towards global warming so it is called a ____ gas:
Answer: Correct Answer:A [Greenhouse]
Notes: Methane (CH4) is a greenhouse gas and causes warming the same way that CO2 does. It absorbs radiation emitted from the surface and re-emits that radiation in all directions with some of the radiation returning to the surface where it is absorbed and converted to heat. In the first two decades after its release, methane is 84 times more potent than carbon dioxide.
Notes: Methane (CH4) is a greenhouse gas and causes warming the same way that CO2 does. It absorbs radiation emitted from the surface and re-emits that radiation in all directions with some of the radiation returning to the surface where it is absorbed and converted to heat. In the first two decades after its release, methane is 84 times more potent than carbon dioxide.
Q 35.Which one of these animals is jawless?
Answer: Correct Answer:B [Myxine]
Notes: Myxine is a species of jawless fish (Agnatha). It is known as Hag fish in Europe. These are generally classified with the lampreys into the superclass Agnatha (jawless vertebrates) within the subphylum Vertebrata. All other living fishes (shark, rays, chimeras and bony fishes) possess true jaws derived from gill arches and are placed in the superclass Gnathostomata.
Notes: Myxine is a species of jawless fish (Agnatha). It is known as Hag fish in Europe. These are generally classified with the lampreys into the superclass Agnatha (jawless vertebrates) within the subphylum Vertebrata. All other living fishes (shark, rays, chimeras and bony fishes) possess true jaws derived from gill arches and are placed in the superclass Gnathostomata.
Q 36.Which of the following is an insectivorous plant?
Answer: Correct Answer:D [Drosera]
Notes: An insectivorous plant, also called a carnivorous plant, captures prey items, such as insects, spiders, crustaceans, mites, and protozoans, as a nitrogen source. Aldrovanda, Dionaea, Drosera, Drosophyllum, etc are some of them under the Droseraceae family.
Notes: An insectivorous plant, also called a carnivorous plant, captures prey items, such as insects, spiders, crustaceans, mites, and protozoans, as a nitrogen source. Aldrovanda, Dionaea, Drosera, Drosophyllum, etc are some of them under the Droseraceae family.
Q 37.Which of the following is a fat-soluble vitamin that plays a role in blood clotting, bone metabolism and regulating blood calcium levels?
Answer: Correct Answer:D [Vitamin K]
Notes: Vitamin K refers to a group of fat-soluble vitamins that play a role in blood clotting, bone metabolism, and regulating blood calcium levels. The body needs vitamin K to produce prothrombin, a protein and clotting factor that is important in blood clotting and bone metabolism.
Notes: Vitamin K refers to a group of fat-soluble vitamins that play a role in blood clotting, bone metabolism, and regulating blood calcium levels. The body needs vitamin K to produce prothrombin, a protein and clotting factor that is important in blood clotting and bone metabolism.
Q 38.Bulbils takes part in ____:
Answer: Correct Answer:D [Vegetative reproduction]
Notes: Bulbil is a small bulblike organ of vegetative reproduction growing in leaf axils or on flower stalks of plants such as the onion and tiger lily. It is a reproductive organ that takes part in vegetative reproduction. The bulbils drop from the parent plant on to the ground, give out adventitious roots and develop into new plants. The other structures involved in vegetative propagation include rhizome, bulb, corm, cuttings, etc.
Notes: Bulbil is a small bulblike organ of vegetative reproduction growing in leaf axils or on flower stalks of plants such as the onion and tiger lily. It is a reproductive organ that takes part in vegetative reproduction. The bulbils drop from the parent plant on to the ground, give out adventitious roots and develop into new plants. The other structures involved in vegetative propagation include rhizome, bulb, corm, cuttings, etc.
Q 39.Opium is a plant product obtained from _____:
Answer: Correct Answer:B [Dried latex]
Notes: Opium is the dried latex obtained from the opium poppy. Opium contains approximately 12% morphine, an alkaloid, which is frequently processed chemically to produce heroin for the illegal drug trade. The latex also includes codeine and non-narcotic alkaloids such as papaverine, thebaine and noscapine.
Notes: Opium is the dried latex obtained from the opium poppy. Opium contains approximately 12% morphine, an alkaloid, which is frequently processed chemically to produce heroin for the illegal drug trade. The latex also includes codeine and non-narcotic alkaloids such as papaverine, thebaine and noscapine.
Q 40.Which of the following is the third stage in the metamorphosis of a butterfly?
Answer: Correct Answer:B [Pupa]
Notes: The butterfly and moth develop through a process called metamorphosis. All butterflies have “complete metamorphosis.” To grow into an adult they go through 4 stages: egg, larva, pupa and adult.
Notes: The butterfly and moth develop through a process called metamorphosis. All butterflies have “complete metamorphosis.” To grow into an adult they go through 4 stages: egg, larva, pupa and adult.
Q 41.Which of the following is a warm blooded animal?
Answer: Correct Answer:D [Ape]
Notes: All mammals and birds are warm-blooded while all reptiles, arachnids, insects, amphibians, fish are coldblooded. Therefore, all primates (such as humans, apes, and monkeys), cats (tigers, cheetahs, and domestic cats), rodents (rats, beavers, and chipmunks), marsupials (kangaroo), weasels (badgers and meerkats), monotremes (platypuses), sea mammals (whales, seals, walruses, manatees, and dolphins), dogs, pigs, and elephants are warm-blooded.
Notes: All mammals and birds are warm-blooded while all reptiles, arachnids, insects, amphibians, fish are coldblooded. Therefore, all primates (such as humans, apes, and monkeys), cats (tigers, cheetahs, and domestic cats), rodents (rats, beavers, and chipmunks), marsupials (kangaroo), weasels (badgers and meerkats), monotremes (platypuses), sea mammals (whales, seals, walruses, manatees, and dolphins), dogs, pigs, and elephants are warm-blooded.
Q 42.How many number of chambers are there in human heart?
Answer: Correct Answer:C [Four]
Notes: The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes. The human heart has four chambers: two upper chambers (the atria) and two lower ones (the ventricles).
Notes: The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes. The human heart has four chambers: two upper chambers (the atria) and two lower ones (the ventricles).
Q 43.The Ozone layer protects us from _____:
Answer: Correct Answer:B [Ultra-Violet rays]
Notes: The ozone layer refers to a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet (UV) radiation. It absorbs 97–99% of the Sun’s medium frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which otherwise would potentially damage exposed life forms near the surface.
Notes: The ozone layer refers to a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet (UV) radiation. It absorbs 97–99% of the Sun’s medium frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which otherwise would potentially damage exposed life forms near the surface.
Q 44.Goitre is caused by the deficiency of _____:
Answer: Correct Answer:A [Iodine]
Notes: A goitre is a swelling of the thyroid gland, which can lead to a swelling of the neck or larynx (voice box). Goitre is a term that refers to an enlargement of the thyroid (thyromegaly) and can be associated with a thyroid gland that is functioning properly or not. Worldwide, the most common cause for goitre is iodine deficiency, usually seen in countries that do not use iodized salt.
Notes: A goitre is a swelling of the thyroid gland, which can lead to a swelling of the neck or larynx (voice box). Goitre is a term that refers to an enlargement of the thyroid (thyromegaly) and can be associated with a thyroid gland that is functioning properly or not. Worldwide, the most common cause for goitre is iodine deficiency, usually seen in countries that do not use iodized salt.
Q 45.Translocation of water is _____:
Answer: Correct Answer:C [Both[A] and[B]]
Notes: The transport of soluble organic substances (sometimes called assimilates) within a plant is known as translocation. Both the symplast and the apoplast function in transport within tissues and organs of plants. Water passes into the stele through symplastic route and water passes into the xylem through apoplastic route.
Notes: The transport of soluble organic substances (sometimes called assimilates) within a plant is known as translocation. Both the symplast and the apoplast function in transport within tissues and organs of plants. Water passes into the stele through symplastic route and water passes into the xylem through apoplastic route.
Q 46.Ozone protects biosphere from _____:
Answer: Correct Answer:B [Ultraviolet rays]
Notes: Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
Notes: Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
Q 47.Which of the following statement(s) is/are correct?
Answer: Correct Answer:B [Oxides of non-metals are acidic.]
Notes: The oxides formed by non-metals are acidic or neutral in nature. For example, Carbon reacts with Oxygen to form Carbon monoxide which is neutral oxide and also forms Carbon dioxide which is acidic in nature.2C + O2 —> 2CO C + O2 —> CO2Similarly Nitrogen reacts with Oxygen to form acidic and neutral oxides. Non-metal oxides such as sulphur dioxide and nitrogen oxide are responsible for acid rain.
Notes: The oxides formed by non-metals are acidic or neutral in nature. For example, Carbon reacts with Oxygen to form Carbon monoxide which is neutral oxide and also forms Carbon dioxide which is acidic in nature.2C + O2 —> 2CO C + O2 —> CO2Similarly Nitrogen reacts with Oxygen to form acidic and neutral oxides. Non-metal oxides such as sulphur dioxide and nitrogen oxide are responsible for acid rain.
Q 48.Rock Salt contains which mineral?
Answer: Correct Answer:B [Sodium]
Notes: Rock salt is the mineral (natural) form of sodium chloride (NaCl). It has high quantities of phosphorous, calcium, potassium, iron, magnesium, zinc, selenium, copper, bromine, zirconium and iodine. All of these minerals occur naturally.
Notes: Rock salt is the mineral (natural) form of sodium chloride (NaCl). It has high quantities of phosphorous, calcium, potassium, iron, magnesium, zinc, selenium, copper, bromine, zirconium and iodine. All of these minerals occur naturally.
Q 49.LPG is a mixture of:
Answer: Correct Answer:B [butane and propane]
Notes: Liquefied petroleum gas (LPG) is mostly propane (C3H8), mostly butane (C4H10) and, most commonly, mixes including both propane and butane. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
Notes: Liquefied petroleum gas (LPG) is mostly propane (C3H8), mostly butane (C4H10) and, most commonly, mixes including both propane and butane. In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.
Q 50.What is the chemical name of vinegar?
Answer: Correct Answer:A [Acetic Acid]
Notes: Vinegar is a liquid consisting of about 5–20% acetic acid (CH3COOH), water, and other trace chemicals. Acetic acid is the major characterizing component of vinegar. Its concentration determines the stren-gth of the vinegar, a value termed ‘grain strength,’ which is equal to 10 times the acetic acid concentration.
Notes: Vinegar is a liquid consisting of about 5–20% acetic acid (CH3COOH), water, and other trace chemicals. Acetic acid is the major characterizing component of vinegar. Its concentration determines the stren-gth of the vinegar, a value termed ‘grain strength,’ which is equal to 10 times the acetic acid concentration.