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Q1. The type of nutrition where animals obtain food by eating other organisms is called:
Animals cannot make their own food and depend on other organisms (plants or animals) for nutrition. This mode is called heterotrophic nutrition. Autotrophic nutrition is when organisms make their own food (like plants). Parasitic and symbiotic are specific types of heterotrophic relationships. Animals are generally heterotrophs.
Q2. An animal with a long, sticky tongue to catch ants and termites is the:
An anteater has a long, sticky tongue specially adapted to catch ants and termites. Eagles have sharp beaks and talons, snakes have forked tongues, and frogs have sticky tongues for catching insects. The anteater is specifically known for its long, sticky tongue used for feeding on ants and termites.
Q3. An animal that filters tiny food particles from water is the:
Baleen whales filter tiny food particles (like plankton) from water using their baleen plates. Eagles are birds of prey, snails scrape food, and starfish evert their stomach. Whales are the best example of filter feeders among the options.
Q4. A snail uses its file-like tongue to:
A snail has a file-like tongue called a radula, which it uses to scrape food particles from surfaces like leaves or rocks. It does not bite, chew, or suck in the same way as other animals. The radula is specifically adapted for scraping.
Q5. The chewed, moistened ball of food that is formed in the mouth is called a:
The chewed and moistened ball of food formed in the mouth is called a bolus. Chyme is the semi-digested food that leaves the stomach, faeces is undigested waste, and villi are finger-like projections in the small intestine. The bolus is the food ball formed before swallowing.
Q6. The rhythmic contraction of muscles in the walls of the alimentary canal that pushes food forward is called:
Peristalsis is the rhythmic contraction and relaxation of muscles in the walls of the alimentary canal that pushes food forward. Digestion is the breakdown of food, absorption is the uptake of nutrients, and egestion is the removal of waste. Peristalsis is the movement process.
Q7. A vestigial organ in the human body is the:
The appendix is a vestigial organ in humans, meaning it has no significant digestive function and is a remnant from our evolutionary past. The liver, stomach, and small intestine all have essential digestive functions. The appendix is the correct answer for a vestigial organ.
Q8. The part of the tooth visible above the gums is called the:
The part of the tooth visible above the gums is called the crown. The root is embedded in the jawbone, enamel is the outer layer of the crown, and the neck is the area where the crown meets the root. The crown is the visible part of the tooth.
Q9. The pancreas secretes pancreatic juice which acts on:
Pancreatic juice contains enzymes that act on all components of food: amylase for carbohydrates, trypsin for proteins, and lipase for fats. It is a complete digestive juice. The other options are incorrect because pancreatic juice is not limited to just one food component.
Q10. If we get a cut in our mouth, it heals faster than a cut on our skin. This is because:
Saliva contains an enzyme called lysozyme that kills bacteria, which helps prevent infection and speeds healing in the mouth. The mouth does have good blood supply, but the primary reason for faster healing is the antibacterial properties of saliva. The tongue and teeth are not directly responsible for faster healing.
Q11. The process of taking food into the body is called:
Ingestion is the process of taking food into the body through the mouth. Digestion is the breakdown of food, absorption is the uptake of nutrients into the blood, and egestion is the removal of undigested waste. Ingestion is the first step of nutrition.
Q12. An organism that breaks down its food outside the body before consuming it is the:
A housefly vomits digestive juices on its food, breaking it down outside its body before sucking it up. Eagles eat directly, butterflies sip nectar, and ants carry food. The housefly is a classic example of external digestion.
Q13. The mode of taking in food by a hummingbird is:
A hummingbird uses its long, slender beak to suck nectar from flowers. Scraping is used by snails, chewing by many animals, and siphoning is used by butterflies. Sucking is the correct feeding mode for hummingbirds.
Q14. Animals like lice that live on other organisms and feed on their blood are called:
Lice live on other organisms (hosts) and feed on their blood, making them parasites. Scavengers eat dead animals, predators hunt and kill prey, and decomposers break down dead matter. Lice are parasites that harm their hosts.
Q15. The mode of feeding in an ant is:
Ants have strong mandibles that they use to chew and carry food. They do not suck (like mosquitoes), scrape (like snails), or filter (like whales). Chewing is the correct mode of feeding for ants.
Q16. A bird of prey that tears the flesh of its victims with its strong beak is the:
Eagles are birds of prey with strong, hooked beaks adapted for tearing flesh. Hummingbirds sip nectar, sparrows eat seeds, and ducks filter food. Eagles are predators that tear flesh with their beaks.
Q17. The mode of feeding in a mosquito is:
Mosquitoes have a piercing-sucking mouthpart. They pierce the skin and suck blood. They do not chew, bite (in the sense of tearing), or scrape. Sucking is the correct mode of feeding for mosquitoes.
Q18. The mode of feeding in a butterfly is:
Butterflies have a long, coiled tube called a proboscis that they use to siphon nectar from flowers. Sucking is similar, but siphoning is the more specific term for butterflies. Chewing is for caterpillars, and sponging is for houseflies. Siphoning is the correct answer.
Q19. A starfish pushes out its stomach to digest its prey:
A starfish everts its stomach out of its body to digest its prey externally. This allows it to consume prey larger than its mouth. It does not digest inside its body, in its mouth, or in its intestine. External digestion is the key feature of starfish feeding.
Q20. The long tube that begins at the mouth and ends at the anus is called the:
The alimentary canal is the long tube that begins at the mouth and ends at the anus. The food pipe is a part of it, the windpipe is part of the respiratory system, and the buccal cavity is the mouth cavity. The alimentary canal is the entire digestive tract.
Q21. The process of breakdown of complex food substances into simpler substances is called:
Digestion is the process of breaking down complex food substances into simpler, absorbable forms. Ingestion is taking in food, absorption is the uptake of nutrients, and assimilation is using nutrients by the body. Digestion is the breakdown process.
Q22. The part of the alimentary canal where food enters from the mouth is called the:
The buccal cavity (mouth) is where food enters the alimentary canal. The stomach, food pipe, and small intestine are later parts of the digestive tract. The buccal cavity is the first part of the alimentary canal.
Q23. The tube that carries food from the mouth to the stomach is called the:
The food pipe (esophagus) carries food from the mouth to the stomach. The windpipe carries air, the small intestine is for digestion and absorption, and the large intestine is for water absorption. The food pipe is the correct answer.
Q24. The process by which the walls of the food pipe push the food down is called:
Peristalsis is the rhythmic contraction of muscles that pushes food down the food pipe and through the alimentary canal. Digestion is the breakdown of food, absorption is the uptake of nutrients, and egestion is waste removal. Peristalsis is the movement process.
Q25. The largest gland in the human body is the:
The liver is the largest gland in the human body. The pancreas is also a gland but is smaller, salivary glands are much smaller, and the stomach is an organ, not a gland. The liver secretes bile and has many metabolic functions.
Q26. The finger-like outgrowths in the small intestine that increase the surface area for absorption are called:
Villi are finger-like projections in the small intestine that increase the surface area for absorption of nutrients. Rugae are folds in the stomach, taste buds are on the tongue, and pores are openings. Villi are essential for efficient nutrient absorption.
Q27. The process of taking in digested food into the bloodstream is called:
Absorption is the process by which digested food passes into the bloodstream through the walls of the small intestine. Digestion is the breakdown, assimilation is the use of nutrients, and egestion is waste removal. Absorption is the correct term.
Q28. The process by which absorbed food is used by the body for energy, growth, and repair is called:
Assimilation is the process by which absorbed nutrients are used by the body for energy, growth, and repair. Digestion is breakdown, absorption is uptake, and egestion is waste removal. Assimilation is the utilization of nutrients.
Q29. The removal of undigested food from the body is called:
Egestion is the removal of undigested food from the body through the anus. Excretion is the removal of metabolic wastes (like urea), while egestion specifically refers to undigested food. Digestion and absorption are earlier steps. Egestion is the correct term.
Q30. The first set of teeth that grows during infancy is called:
The first set of teeth that grow during infancy are called milk teeth (or deciduous teeth). Permanent teeth replace them later. Incisors and molars are types of teeth, not the entire set. Milk teeth are the temporary teeth of childhood.
Q31. The set of teeth that replaces the milk teeth in humans is called:
The set of teeth that replaces milk teeth in humans is called permanent teeth. Milk teeth are the first set, temporary teeth is another name for milk teeth, and deciduous teeth also refer to milk teeth. Permanent teeth are the adult set.
Q32. The glands that secrete saliva in the mouth are called:
The salivary glands secrete saliva in the mouth. Gastric glands are in the stomach, the liver secretes bile, and the pancreas secretes pancreatic juice. Salivary glands are specifically located in the mouth and produce saliva.
Q33. The enzyme present in saliva that breaks down starch into sugar is:
Salivary amylase is the enzyme present in saliva that breaks down starch into sugar. Pepsin is in the stomach, trypsin is in the pancreas, and lipase breaks down fats. Salivary amylase is the correct enzyme for starch digestion in the mouth.
Q34. If you chew a piece of bread for a few minutes, it starts tasting sweet. This is because:
When you chew bread, salivary amylase breaks down the starch into sugar (maltose), which tastes sweet. The bread does not become salty, old, or change taste because of teeth. The sweet taste is due to the enzymatic action of saliva.
Q35. The acid present in our stomach that helps in killing bacteria and creating an acidic medium is:
Hydrochloric acid is present in the stomach and helps kill bacteria and creates an acidic medium for enzymes like pepsin to work. Sulphuric acid, nitric acid, and citric acid are not present in the stomach. Hydrochloric acid is the correct answer.
Q36. The organ that stores bile juice is called the:
The gall bladder stores bile juice produced by the liver. The liver produces bile, the stomach churns food, and the pancreas secretes pancreatic juice. The gall bladder is the storage organ for bile.
Q37. The semi-digested, acidic food that comes from the stomach is called:
Chyme is the semi-digested, acidic food that leaves the stomach and enters the small intestine. Bolus is the food ball in the mouth, chyle is the milky fluid in the lymphatic system, and faeces is undigested waste. Chyme is the correct term for stomach contents.
Q38. The part of the large intestine that has a small, finger-like structure called the appendix is the:
The caecum is the part of the large intestine where the appendix is attached. The rectum stores faeces, the anus is the opening, and the colon is the main part of the large intestine. The appendix is attached to the caecum.
Q39. The last part of the large intestine which stores undigested food (feces) is called the:
The rectum is the last part of the large intestine that stores undigested food (feces) before it is egested. The anus is the opening, the colon is the main part of the large intestine, and the caecum is the first part. The rectum is the storage site.
Q40. The opening at the end of the alimentary canal through which undigested food is egested is called the:
The anus is the opening at the end of the alimentary canal through which undigested food (feces) is egested. The mouth is for ingestion, the rectum stores feces, and the buccal cavity is the mouth cavity. The anus is the exit point.
Q41. The teeth used for cutting and biting food are called:
Incisors are the flat, chisel-shaped teeth at the front of the mouth used for cutting and biting food. Canines are for tearing, premolars and molars are for grinding and chewing. Incisors are the correct teeth for cutting.
Q42. The teeth used for tearing food are called:
Canines are pointed teeth used for tearing food. Incisors are for cutting, premolars and molars are for grinding and chewing. Canines are the tearing teeth, especially well-developed in carnivores.
Q43. The flat teeth at the back of the mouth used for grinding and chewing food are called:
Premolars and molars are the flat teeth at the back of the mouth used for grinding and chewing food. Incisors cut, canines tear. Premolars and molars are the grinding teeth.
Q44. Tooth decay is caused by the action of:
Tooth decay is caused by bacteria in the mouth that feed on sugars and produce acids that erode the tooth enamel. Worms do not cause tooth decay, lack of calcium affects bones, and water does not cause decay. Bacteria are the primary cause of tooth decay.
Q45. The hardest substance in the human body is:
Enamel, the outer layer of teeth, is the hardest substance in the human body. It is even harder than bone. Cartilage is softer, nails are keratinized protein. Enamel protects teeth from wear and decay.
Q46. A small, worm-like structure attached to the large intestine that has no specific digestive function in humans is the:
The appendix is a small, worm-like structure attached to the large intestine that has no specific digestive function in humans. The liver and pancreas are digestive organs, and villi are in the small intestine. The appendix is a vestigial organ.
Q47. The muscular bag-like organ that churns food and mixes it with digestive juices is called the:
The stomach is a muscular, bag-like organ that churns food and mixes it with digestive juices (gastric juice). The food pipe transports food, the small intestine is for digestion and absorption, and the large intestine absorbs water. The stomach is the churning organ.
Q48. The part of the alimentary canal where the maximum digestion and absorption of food takes place is the:
The small intestine is where the maximum digestion and absorption of food takes place. It receives digestive juices from the pancreas and liver and has villi for absorption. The stomach does some digestion, and the large intestine absorbs water. The small intestine is the main site.
Q49. The part of the alimentary canal where water is absorbed from the undigested food is the:
The large intestine absorbs water from the undigested food, forming solid faeces. The stomach and small intestine are for digestion and absorption of nutrients, and the food pipe transports food. Water absorption is a key function of the large intestine.
Q50. A vestigial organ in the human body is the:
The appendix is a vestigial organ in humans, meaning it has no significant digestive function and is a remnant from our evolutionary past. The liver, stomach, and small intestine all have essential digestive functions. The appendix is the correct answer for a vestigial organ.
Q51. The pancreas secretes pancreatic juice which acts on:
Pancreatic juice contains enzymes that act on all components of food: amylase for carbohydrates, trypsin for proteins, and lipase for fats. It is a complete digestive juice. The other options are incorrect because pancreatic juice is not limited to just one food component.
Q52. If we get a cut in our mouth, it heals faster than a cut on our skin. This is because:
Saliva contains an enzyme called lysozyme that kills bacteria, which helps prevent infection and speeds healing in the mouth. The mouth does have good blood supply, but the primary reason for faster healing is the antibacterial properties of saliva. The tongue and teeth are not directly responsible for faster healing.