Animal Nutrition: Diet, Malnutrition, Digestion, Absorption and Assimilation
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A student eats a diet that provides enough energy but contains very little protein.
Which condition is most likely to develop?
A rickets
B scurvy
C kwashiorkor
D constipation
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Which row correctly matches nutrient, digestion product and site of absorption?
A starch → amino acids → stomach
B protein → fatty acids and glycerol → ileum
C lipid → fatty acids and glycerol → ileum
D cellulose → glucose → colon
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A person has bleeding gums, slow wound healing and frequent infections.
Which dietary deficiency is most likely?
A vitamin C
B vitamin D
C iron
D calcium
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Which statement correctly describes assimilation?
A movement of digested food molecules through the wall of the ileum into blood or lymph
B conversion of absorbed food molecules into parts of cells or useful body substances
C mechanical breakdown of food into smaller pieces in the mouth
D removal of undigested food from the alimentary canal
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Which enzyme begins the digestion of starch in the mouth?
A protease
B amylase
C lipase
D maltase
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A person’s gall bladder is removed. They can still produce bile, but bile is not stored and released in the same way.
Which process is most directly affected?
A starch digestion by amylase
B emulsification of fats in the small intestine
C protein digestion by pepsin in the stomach
D absorption of amino acids into blood capillaries
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Which statement about bile is correct?
A bile contains enzymes that digest fats into fatty acids
B bile is made in the gall bladder and stored in the liver
C bile neutralises acidic chyme and emulsifies fats
D bile breaks protein into amino acids
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Which food group is most directly needed to prevent constipation?
A saturated fat
B fibre
C vitamin D
D glucose
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Which row correctly matches deficiency and disease?
A vitamin C deficiency → rickets
B vitamin D deficiency → scurvy
C iron deficiency → anaemia
D calcium deficiency → obesity
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A student tests a meal and finds it contains a very high proportion of saturated fat and sugar but very little fibre.
Which risk is most directly increased?
A coronary heart disease and constipation
B scurvy and rickets
C kwashiorkor and marasmus
D anaemia and night blindness
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Which enzyme is correctly matched with its product?
A amylase produces maltose from starch
B protease produces glucose from protein
C lipase produces amino acids from lipid
D maltase produces starch from maltose
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Which sequence correctly shows the path of food through the alimentary canal?
A mouth → oesophagus → stomach → small intestine → large intestine → rectum → anus
B mouth → stomach → oesophagus → small intestine → rectum → large intestine → anus
C mouth → oesophagus → small intestine → stomach → large intestine → anus → rectum
D mouth → trachea → stomach → ileum → colon → anus
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.
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Which organ produces pancreatic amylase, trypsin and lipase?
A liver
B pancreas
C stomach
D gall bladder
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A person has weak bones and poor blood clotting.
Which minerals are most directly involved?
A iron and sodium
B calcium and iron
C calcium and vitamin K
D iodine and potassium
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Which substance is absorbed into lacteals rather than directly into blood capillaries?
A glucose
B amino acids
C fatty acids and glycerol
D mineral ions
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Which feature of villi most directly maintains a steep concentration gradient for glucose absorption?
A thin epithelium
B many mitochondria in epithelial cells
C dense network of blood capillaries
D presence of mucus-producing cells
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A student says, “The stomach completes digestion of all food molecules.”
Which correction is best?
A the stomach mainly digests starch and absorbs glucose
B the stomach mainly digests protein; most digestion and absorption occur in the small intestine
C the stomach only absorbs fats into lacteals
D the stomach only stores bile and emulsifies lipids
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Which statement about physical digestion is correct?
A it breaks chemical bonds in large food molecules
B it increases surface area for enzyme action
C it converts amino acids into proteins
D it occurs only in the ileum
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Which process occurs in the large intestine?
A absorption of most digested glucose
B production of bile
C absorption of water from undigested material
D digestion of starch by salivary amylase
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Which row correctly shows enzyme, optimum region and substrate?
A pepsin, stomach, protein
B maltase, stomach, lipid
C lipase, mouth, starch
D amylase, colon, protein
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A child has a swollen abdomen, thin limbs, poor growth and oedema despite eating enough carbohydrate.
Which diagnosis best fits?
A scurvy
B kwashiorkor
C rickets
D anaemia
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Why does the stomach contain hydrochloric acid?
A to emulsify fats and neutralise bile
B to provide acidic pH for protease and kill bacteria
C to digest starch into maltose
D to absorb amino acids into lacteals
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Which nutrient is needed to make haemoglobin?
A iron
B vitamin C
C fibre
D vitamin D
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Which statement correctly compares absorption and assimilation?
A absorption is chemical digestion; assimilation is mechanical digestion
B absorption moves digested molecules into blood/lymph; assimilation uses them in cells
C absorption occurs only in the stomach; assimilation occurs only in the mouth
D absorption produces enzymes; assimilation produces bile
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A person eats a meal rich in starch, protein and lipid. Which products should be absorbed after complete digestion?
A glucose, amino acids, fatty acids and glycerol
B starch, protein, lipid and water
C maltose, peptides and emulsified fat only
D cellulose, glycogen and bile salts
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.
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Which statement about a balanced diet is correct?
A it contains equal masses of every nutrient
B it contains only carbohydrates, proteins and fats
C it provides nutrients and energy in the correct proportions for age, sex and activity
D it avoids all lipids because lipids are harmful
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Which person is likely to need the highest energy intake?
A inactive adult working at a desk
B elderly person with low activity level
C teenager doing heavy physical training
D adult sleeping for most of the day
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Which structure prevents food from entering the trachea during swallowing?
A epiglottis
B pancreas
C diaphragm
D gall bladder
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Which substance is not digested by human enzymes but is useful in the diet?
A starch
B protein
C cellulose
D lipid
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Which statement correctly describes peristalsis?
A contraction and relaxation of muscles to move food along the alimentary canal
B diffusion of glucose through the ileum wall
C release of bile from the liver into the blood
D chewing food using teeth and saliva
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A patient has part of the ileum removed.
Which process is most directly reduced?
A production of bile
B absorption of digested nutrients
C storage of faeces
D chewing and swallowing
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Which row correctly matches teeth with function?
A incisors: grinding; molars: tearing
B canines: cutting; incisors: grinding
C incisors: cutting; molars: grinding
D molars: cutting; canines: grinding
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Which condition is most likely caused by excess energy intake over a long period?
A obesity
B anaemia
C scurvy
D rickets
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Which statement about lipase is correct?
A it digests lipids into fatty acids and glycerol
B it digests starch into maltose
C it digests protein into amino acids
D it emulsifies fat droplets without changing molecules chemically
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Why does emulsification increase the rate of lipid digestion?
A it changes lipids into amino acids
B it increases the surface area of lipid droplets for lipase action
C it denatures lipase permanently
D it converts bile into fatty acids
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A student claims, “All digestion requires enzymes.”
Which example weakens this claim?
A starch digestion by amylase
B protein digestion by protease
C fat emulsification by bile
D maltose digestion by maltase
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Which statement about digestion of carbohydrates is correct?
A starch is digested to maltose by amylase, then maltose to glucose by maltase
B starch is digested directly to amino acids by protease
C glucose is digested into starch by amylase
D cellulose is digested to glucose by human enzymes
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A meal contains protein but no carbohydrate or lipid.
Which digestive products are expected after complete enzyme digestion?
A glucose only
B amino acids only
C fatty acids and glycerol only
D maltose and glucose
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.
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Which adaptation of the ileum increases absorption by active transport?
A villi have thick walls to slow diffusion
B epithelial cells have mitochondria to provide energy
C lacteals absorb all glucose
D bile salts are secreted from villi
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Which product of digestion is used to build new proteins in the body?
A glucose
B amino acids
C fatty acids
D glycerol
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Which statement about water in the diet is correct?
A it is not needed if enough carbohydrates are eaten
B it is needed as a solvent and for transport of substances
C it provides most of the body’s energy
D it is digested by enzymes before absorption
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Which symptom is most directly linked with iron deficiency?
A reduced oxygen transport and tiredness
B weak bones due to poor calcium absorption
C bleeding gums due to poor collagen formation
D excess fat storage under the skin
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Which organ stores faeces before egestion?
A rectum
B stomach
C pancreas
D ileum
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Which statement correctly distinguishes egestion from excretion?
A egestion removes undigested food from the alimentary canal; excretion removes metabolic waste
B egestion removes urea from blood; excretion removes faeces
C egestion occurs in kidneys; excretion occurs in the mouth
D egestion and excretion are the same process
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Which diet would most likely cause marasmus in a child?
A low energy intake overall
B high carbohydrate but low protein intake
C low vitamin C but normal energy intake
D low iron but high protein intake
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A person has rickets. Which nutrients are most likely deficient?
A vitamin D and calcium
B vitamin C and iron
C protein and fibre
D glucose and water
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Which statement about the liver’s role after absorption is correct?
A it converts excess glucose into glycogen for storage
B it makes salivary amylase for the mouth
C it absorbs fatty acids directly into lacteals
D it stores faeces before egestion
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Which result is most likely if the pancreas stops secreting digestive enzymes into the small intestine?
A digestion of starch, protein and lipid decreases
B absorption of water in colon stops instantly
C bile can no longer be stored
D teeth cannot mechanically digest food
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Which statement best explains why villi are one cell thick?
A to reduce the diffusion distance for digested molecules
B to increase the amount of undigested fibre
C to prevent glucose entering the blood
D to store bile before it enters the ileum
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A student eats excess amino acids.
What is most likely to happen to the excess amino acids?
A stored unchanged as protein in the gall bladder
B deaminated in the liver, with the nitrogen-containing part converted to urea
C converted directly into bile in the stomach
D absorbed into lacteals and stored as cellulose
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.
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Answer: C
A is wrong because rickets is linked to vitamin D/calcium deficiency.
B is wrong because scurvy is caused by vitamin C deficiency.
C is correct because lack of protein despite enough energy causes kwashiorkor.
D is wrong because constipation is mainly linked to low fibre intake. -
Answer: C
A is wrong because starch is digested to maltose/glucose, not amino acids.
B is wrong because protein is digested to amino acids, not fatty acids and glycerol.
C is correct because lipids are digested to fatty acids and glycerol, absorbed in the ileum.
D is wrong because humans cannot digest cellulose into glucose. -
Answer: A
A is correct because vitamin C deficiency causes scurvy, with bleeding gums, poor wound healing and reduced resistance to infection.
B is wrong because vitamin D deficiency causes rickets/weak bones.
C is wrong because iron deficiency causes anaemia.
D is wrong because calcium deficiency affects bones and teeth more directly. -
Answer: B
A is wrong because this describes absorption.
B is correct because assimilation is the use/conversion of absorbed molecules into cell parts or useful body substances.
C is wrong because this describes mechanical digestion.
D is wrong because this describes egestion. -
Answer: B
A is wrong because protease digests protein.
B is correct because amylase begins starch digestion in the mouth.
C is wrong because lipase digests lipids.
D is wrong because maltase digests maltose, mainly in the small intestine. -
Answer: B
A is wrong because bile does not digest starch.
B is correct because bile helps emulsify fats in the small intestine, and gall bladder removal affects bile storage/release.
C is wrong because pepsin acts in the stomach and does not require bile.
D is wrong because bile is not directly needed for amino acid absorption. -
Answer: C
A is wrong because bile does not contain digestive enzymes.
B is wrong because bile is made in the liver and stored in the gall bladder.
C is correct because bile neutralises acidic chyme and emulsifies fats.
D is wrong because proteases digest protein into amino acids. -
Answer: B
A is wrong because saturated fat does not prevent constipation.
B is correct because fibre adds bulk and helps movement of food through the gut.
C is wrong because vitamin D is for calcium absorption/bone health.
D is wrong because glucose provides energy, not fibre bulk. -
Answer: C
A is wrong because vitamin C deficiency causes scurvy.
B is wrong because vitamin D deficiency causes rickets.
C is correct because iron deficiency causes anaemia.
D is wrong because obesity is caused by excess energy intake, not calcium deficiency. -
Answer: A
A is correct because high saturated fat increases risk of coronary heart disease, while low fibre increases constipation risk.
B is wrong because scurvy and rickets are vitamin deficiencies.
C is wrong because kwashiorkor and marasmus are protein/energy malnutrition diseases.
D is wrong because anaemia is linked to iron deficiency, and night blindness is linked to vitamin A deficiency. -
Answer: A
A is correct because amylase breaks starch into maltose.
B is wrong because protease produces amino acids from protein.
C is wrong because lipase produces fatty acids and glycerol from lipids.
D is wrong because maltase breaks maltose into glucose. -
Answer: A
A is correct: mouth → oesophagus → stomach → small intestine → large intestine → rectum → anus.
B is wrong because the oesophagus comes before the stomach, and large intestine comes before rectum.
C is wrong because the stomach comes before the small intestine, and rectum comes before anus.
D is wrong because food should not enter the trachea.
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.
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Answer: B
A is wrong because the liver produces bile.
B is correct because the pancreas produces pancreatic amylase, trypsin and lipase.
C is wrong because the stomach produces gastric juice, including protease.
D is wrong because the gall bladder stores bile; it does not produce enzymes. -
Answer: C
A is wrong because iron is linked to haemoglobin, not weak bones or clotting directly.
B is wrong because calcium helps bones, but iron is not the key clotting factor here.
C is correct because calcium is needed for strong bones and vitamin K is needed for normal blood clotting.
D is wrong because iodine and potassium do not best explain weak bones plus poor clotting. -
Answer: C
A is wrong because glucose is absorbed into blood capillaries.
B is wrong because amino acids are absorbed into blood capillaries.
C is correct because fatty acids and glycerol enter lacteals.
D is wrong because mineral ions enter blood capillaries. -
Answer: C
A is wrong because a thin epithelium reduces diffusion distance, but does not mainly maintain the gradient.
B is wrong because mitochondria provide energy for active transport, not mainly gradient maintenance.
C is correct because blood capillaries carry absorbed glucose away, maintaining a steep concentration gradient.
D is wrong because mucus-producing cells are not the main feature for glucose absorption. -
Answer: B
A is wrong because starch digestion begins in the mouth and continues in the small intestine, not mainly in the stomach.
B is correct because the stomach mainly digests protein, while most digestion and absorption occur in the small intestine.
C is wrong because lacteals are in villi of the small intestine.
D is wrong because bile is stored in the gall bladder and acts in the small intestine. -
Answer: B
A is wrong because chemical digestion breaks chemical bonds.
B is correct because physical digestion increases surface area for enzyme action.
C is wrong because amino acids are joined to make proteins during assimilation, not physical digestion.
D is wrong because physical digestion occurs in the mouth and stomach too. -
Answer: C
A is wrong because most glucose is absorbed in the small intestine.
B is wrong because bile is produced by the liver.
C is correct because the large intestine absorbs water from undigested material.
D is wrong because salivary amylase acts in the mouth. -
Answer: A
A is correct because pepsin is a stomach protease that digests protein.
B is wrong because maltase acts on maltose, not lipid.
C is wrong because lipase digests lipid, not starch.
D is wrong because amylase digests starch, not protein, and does not mainly act in the colon. -
Answer: B
A is wrong because scurvy causes bleeding gums and poor wound healing.
B is correct because kwashiorkor causes oedema, swollen abdomen, thin limbs and poor growth despite enough carbohydrate.
C is wrong because rickets causes weak/deformed bones.
D is wrong because anaemia causes tiredness due to reduced oxygen transport. -
Answer: B
A is wrong because bile emulsifies fats and neutralises acid, not stomach acid.
B is correct because hydrochloric acid provides acidic pH for stomach protease and kills bacteria.
C is wrong because starch digestion is not the main role of stomach acid.
D is wrong because amino acids are absorbed mainly into blood capillaries in the ileum. -
Answer: A
A is correct because iron is needed to make haemoglobin.
B is wrong because vitamin C is needed for healthy gums, skin and wound healing.
C is wrong because fibre helps prevent constipation.
D is wrong because vitamin D helps calcium absorption. -
Answer: B
A is wrong because absorption and assimilation are not types of digestion.
B is correct because absorption moves digested molecules into blood/lymph, while assimilation uses them in cells.
C is wrong because absorption mainly occurs in the small intestine, not only stomach.
D is wrong because enzymes and bile are secretions, not definitions of absorption/assimilation. -
Answer: A
A is correct because starch gives glucose, protein gives amino acids, and lipid gives fatty acids and glycerol.
B is wrong because starch, protein and lipid are large molecules before digestion.
C is wrong because maltose, peptides and emulsified fat are intermediate/not final absorbed products.
D is wrong because cellulose is not digested by human enzymes, and bile salts are not digestion products.
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.
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Answer: C
A is wrong because a balanced diet does not mean equal masses of every nutrient.
B is wrong because vitamins, minerals, fibre and water are also needed.
C is correct because a balanced diet provides nutrients and energy in correct proportions for age, sex and activity.
D is wrong because some lipids are needed; excess saturated fat is the problem. -
Answer: C
A is wrong because an inactive desk worker needs less energy.
B is wrong because an elderly person with low activity usually needs less energy.
C is correct because a teenager doing heavy physical training has high energy demand for growth and activity.
D is wrong because sleeping uses relatively little energy. -
Answer: A
A is correct because the epiglottis covers the trachea during swallowing.
B is wrong because the pancreas secretes digestive enzymes.
C is wrong because the diaphragm helps breathing.
D is wrong because the gall bladder stores bile. -
Answer: C
A is wrong because starch is digested by amylase.
B is wrong because protein is digested by proteases.
C is correct because cellulose is not digested by human enzymes but is useful as fibre.
D is wrong because lipid is digested by lipase. -
Answer: A
A is correct because peristalsis is wave-like contraction and relaxation of muscles moving food along the alimentary canal.
B is wrong because this describes absorption.
C is wrong because bile is not released into the blood for digestion.
D is wrong because chewing is mechanical digestion, not peristalsis. -
Answer: B
A is wrong because bile is produced by the liver.
B is correct because the ileum is the main site of absorption of digested nutrients.
C is wrong because faeces are stored in the rectum.
D is wrong because chewing and swallowing occur before food reaches the ileum. -
Answer: C
A is wrong because incisors cut and molars grind.
B is wrong because canines tear, and incisors cut.
C is correct because incisors cut and molars grind.
D is wrong because molars grind and canines tear. -
Answer: A
A is correct because excess energy intake over time causes obesity.
B is wrong because anaemia is linked to iron deficiency.
C is wrong because scurvy is linked to vitamin C deficiency.
D is wrong because rickets is linked to vitamin D/calcium deficiency. -
Answer: A
A is correct because lipase digests lipids into fatty acids and glycerol.
B is wrong because amylase digests starch into maltose.
C is wrong because protease digests protein into amino acids.
D is wrong because emulsification is done by bile and is physical, not chemical digestion by lipase. -
Answer: B
A is wrong because emulsification does not change lipids into amino acids.
B is correct because emulsification increases the surface area of lipid droplets for lipase action.
C is wrong because bile does not denature lipase in normal digestion.
D is wrong because bile is not converted into fatty acids. -
Answer: C
A is wrong because starch digestion by amylase uses an enzyme.
B is wrong because protein digestion by protease uses an enzyme.
C is correct because fat emulsification by bile is physical digestion and does not require an enzyme.
D is wrong because maltose digestion by maltase uses an enzyme. -
Answer: A
A is correct because starch is digested into maltose by amylase, then maltose into glucose by maltase.
B is wrong because protease acts on protein, not starch.
C is wrong because glucose is not digested into starch by amylase.
D is wrong because humans do not have enzymes to digest cellulose. -
Answer: B
A is wrong because glucose comes from carbohydrate digestion.
B is correct because complete protein digestion produces amino acids.
C is wrong because fatty acids and glycerol come from lipid digestion.
D is wrong because maltose and glucose come from carbohydrate digestion.
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.
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Answer: B
A is wrong because villi have thin walls, not thick walls.
B is correct because mitochondria provide energy for active transport in epithelial cells.
C is wrong because lacteals absorb fatty acids and glycerol, not all glucose.
D is wrong because bile salts are not secreted from villi. -
Answer: B
A is wrong because glucose is mainly used in respiration or stored as glycogen/fat.
B is correct because amino acids are used to build new proteins.
C is wrong because fatty acids are used for lipids and energy storage.
D is wrong because glycerol is part of lipid metabolism. -
Answer: B
A is wrong because water is still needed even if carbohydrates are eaten.
B is correct because water acts as a solvent and helps transport substances.
C is wrong because water does not provide energy.
D is wrong because water is not digested by enzymes. -
Answer: A
A is correct because iron deficiency reduces haemoglobin, reducing oxygen transport and causing tiredness.
B is wrong because weak bones are linked to vitamin D/calcium deficiency.
C is wrong because bleeding gums are linked to vitamin C deficiency.
D is wrong because excess fat storage is caused by excess energy intake. -
Answer: A
A is correct because the rectum stores faeces before egestion.
B is wrong because the stomach stores and digests food temporarily.
C is wrong because the pancreas produces enzymes.
D is wrong because the ileum absorbs digested nutrients. -
Answer: A
A is correct because egestion removes undigested food from the alimentary canal, while excretion removes metabolic waste.
B is wrong because urea removal is excretion, not egestion.
C is wrong because kidneys are involved in excretion, not egestion.
D is wrong because egestion and excretion are not the same. -
Answer: A
A is correct because marasmus is caused by very low overall energy intake.
B is wrong because high carbohydrate but low protein is more linked to kwashiorkor.
C is wrong because low vitamin C causes scurvy.
D is wrong because low iron causes anaemia. -
Answer: A
A is correct because rickets is caused by vitamin D deficiency and/or calcium deficiency.
B is wrong because vitamin C deficiency causes scurvy and iron deficiency causes anaemia.
C is wrong because protein/fibre deficiency does not cause rickets.
D is wrong because glucose and water deficiency are not the main causes of rickets. -
Answer: A
A is correct because the liver converts excess glucose into glycogen for storage.
B is wrong because salivary amylase is made by salivary glands.
C is wrong because fatty acids enter lacteals in the villi, not directly into the liver first.
D is wrong because faeces are stored in the rectum. -
Answer: A
A is correct because pancreatic enzymes digest starch, protein and lipid in the small intestine.
B is wrong because water absorption in the colon does not instantly stop because pancreatic enzymes stop.
C is wrong because bile storage is the gall bladder’s role.
D is wrong because teeth can still mechanically digest food. -
Answer: A
A is correct because one-cell-thick villi reduce diffusion distance for digested molecules.
B is wrong because villi are not for increasing undigested fibre.
C is wrong because villi help glucose enter the blood.
D is wrong because bile is stored in the gall bladder, not villi. -
Answer: B
A is wrong because excess amino acids are not stored unchanged as protein in the gall bladder.
B is correct because excess amino acids are deaminated in the liver, and the nitrogen-containing part is converted into urea.
C is wrong because bile is made in the liver, not directly from amino acids in the stomach.
D is wrong because lacteals absorb lipid products, and humans do not store cellulose.
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.
