CBSE Questions for Class 11 Medical Biology Digestion And Absorption Quiz 3 - MCQExams.com

Deoxyribonuclease and ribonuclease are secreted by
  • Liver
  • Stomach
  • Pancreas
  • Kidney
Which of the following belongs to the class of pepsin and trypsin?

  • Rennin
  • Sucrose
  • Thyroxin
  • Secretin
Which of the following digest proteins into peptides?
  • Erepsin
  • Rennin
  • Pepsin
  • Lipase
In vertebrates, lacteals are found in
  • Ileum
  • Ischium
  • Oesophagus
  • Ear
The process by which digested food of the alimentary canal passes through its mucous membrane into circulatory system is called
  • Absorption
  • Assimilation
  • Hydrolysis
  • Defecation
Digestion is the conversion of large molecules into small ones. This is due to
  • Better taste
  • More saliva
  • Enzymatic action
  • More Stomach acid
Emulsified fat is digested by
  • Lipase
  • Lipase and hydrolase
  • Bile salts
  • Bile pigments
Which one of the following is the correct matching of the site of action on the given substrate, the enzyme acting upon it and the end product?

  • Small intestine : $$\rightarrow $$ Proteins Pepsin Amino acids
  • Stomach : $$\rightarrow $$ Fats Lipase Micelles
  • Duodemum : $$\rightarrow $$ Triglycerides Trypsin Monoglycerides
  • Small intestine : $$\rightarrow $$ Starch Amylase Disaccharide (Maltose)
If pancreas is removed, which of the following compounds remain undigested?
  • Carbohydrates
  • Fats
  • Proteins
  • All of the above
Sacculus rotundus is present in
  • Duodenum of rabbit
  • Ileum of frog
  • Ileum of rabbit
  • Colon of rabbit
Trypsin is related with digestion of
  • Carbohydrates
  • Proteins
  • Fat
  • None of the above
Some proteolytic enzymes are
  • Trypsin, erepsin, pepsin
  • Amylopsin, steapsin, protease
  • Amylase, lipase, zymase
  • Urease, zymase, dehydrogenase
Alpha 1, 4, glycosidic bonds are broken when
  • Lipid is digested by lipase
  • Protein is digested by pepsin
  • Starch is digested by amylase
  • None of the above
Trypsin a digestive enzyme occurs in which part of GI tract, acts on and works in which condition
  • Starch in buccal cavity in an alkaline medium
  • Protein in stomach in an acidic medium
  • Protein in duodenum in an acidic medium
  • Protein in duodenum in an alkaline medium
Part of the stomach which opens into the duodenum is
  • Cardiac
  • Pylorus
  • Fundus
  • Body
If pH of a protein is 1.6, which enzyme will digest it?
  • Trypsin
  • Pepsin
  • Amylase
  • Erepsin
Milk protein is curdled into calcium paracaseinate by
  • Maltase
  • Rennin
  • Trypsin
  • Lactase
Ptyalin acts upon
  • Fats
  • Proteins
  • Lipids
  • Starch
Pepsin acts on
  • Fats
  • Proteins
  • Carbohydrates
  • Glucose
Digestion of carbohydrate is affected by
  • Erepsin
  • Steapsin
  • Pepsin
  • Less amount of amylase
Which one of the following is the matching pair of digestive enzyme and substrate?
  • Rennin - Protein
  • Amylase - Lactose
  • Trypsin - Starch
  • Invertase - Maltose
Which of the following is not present in pancreatic juice?
  • Trypsinogen
  • Chymotrypsin
  • Pepsin
  • Lipase
Which one of the following will not take place when glucose is taken as food?
  • Ingestion
  • Digestion
  • Absorption
  • Assimilation
Rennin acts on milk proteins and converts
  • Caseinogen into casein
  • Casein into paracasein
  • Caseinogen into paracasein
  • Paracasein into carcinogen
Lacteals are found in
  • Liver
  • Lungs
  • Kidney
  • Villus of intestine
Salivary amylase is stimulated by
  • $$K^{+}$$
  • $$N^{+}$$
  • $$HCO_{3}^{-}$$
  • $$Cl^{-}$$
In the human digestive system maltase converts
  • Maltose to glucose at pH greater than 7
  • Maltose to glucose at pH less than 7
  • Maltose to alcohol
  • Starch to maltose at higher pH than 7
Ptyalin is inactivated by a component of gastric juice known as
  • Pepsin
  • Mucus
  • Rennin
  • HCl
Just as hydrochloric acid : Pepsinogen so is
  • Enterokinase : Trypsinogen
  • Haemoglobin : Oxygen
  • Bile juice : Fat
  • Glucagon : Glycogen
In ileum which of the following is absorbed?
  • Vitamin K
  • Bile salt
  • Glucose
  • Fat
Bile salts act as activator of which of the following enzyme?
  • Pepsinogen
  • Trypsinogen
  • Lipase
  • Pancreatic amylase
The above scheme is showing the fate of carbohydrates during digestion in the human alimentary canal. Identify the enzymes acting at stages indicated as A, B, C and D. Choose the best option from those given below.

65838_8bfd3beb1b384519b4a8d4c5def1c425.png
  • $$A= amylase, B = maltase, C = lactase , D = invertase $$
  • $$A= amylase, B = maltase, C = invertase, D = lactase $$
  • $$A= amylase, B = invertase, C = maltase, D = lactase $$
  • $$A= amylase, B = lactase, C = maltase, D = invertase $$
Gastric folds observed when the stomach is empty are known as ___________ .

  • Fiveoles
  • Ancinura angularis
  • Rugae
  • None
Which of the following carries glucose from the digestive tract to the liver?
  • Hepatic artery
  • Pulmonary vein
  • Hepatic portal vein
  • Renal portal system
The folds of Kerkring are developed in

  • Duodenum
  • Jejunum
  • Ileum
  • Large intestine
Taeniae are found in
  • Small intestine
  • Stomach
  • Large Intestine
  • All of the above
Assertion  :  The main part of carbohydrate digestion
                      takes place in small intestine.

Reason    :    Here pancreatic amylase converts
                       carbohydrates into lactose


  • If both the assertion and the reason are true and the reason

    is a correct explanation of the assertion
  • If both the assertion and reason are true but the reason is

    not a correct explanation of the assertion
  • If the assertion is true but the reason is false
  • If both the assertion and reason are false
  • If the assertion is false but reason is true
Assertion  :    Starch is hydrolyzed by protease to maltose.

Reason      :    Sucrase hydrolyzes sucrose to lactose.


  • If both the assertion and the reason are true and the reason

    is a correct explanation of the assertion
  • If both the assertion and reason are true but the reason is

    not a correct explanation of the assertion
  • If the assertion is true but the reason is false
  • If both the assertion and reason are false
  • If the assertion is false but reason is true
Which of the following sugars is absorbed from the small
intestine by facilitated diffusion

  • Fructose
  • Glucose
  • Sucrose
  • Lactose
Wisdom teeth in human is
  • $$3^{rd}$$molar and 4 in number
  • $$3^{rd}$$ molar and 2 in number
  • $$2^{nd}$$molar and 4 in number
  • $$2^{nd}$$ molar and 2 in number
Disaccharide which gives two molecules of glucose is ____________.
  • Lactose
  • Sucrose
  • Maltose
  • Galactose
If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?
  • Proteins breaking down into amino acids.
  • Starch breaking down into sugars.
  • Fats breaking down into fatty acids and glycerol.
  • Absorption of vitamins.
The colour of the faeces is due to the

  • Urochrome
  • Stercobilin
  • Biliverdin
  • Bacteria
Which among the following protects the lining of the stomach from hydrochloric acid?
  • Pepsin
  • Mucus
  • Salivary amylase
  • Bile
Lamina propria is related with

  • Human intestine
  • Liver of human being
  • Graafian follicle
  • Acinus of pancreas
In which part of the alimentary canal, food is finally digested?
  • Stomach
  • Mouth cavity
  • Large intestine
  • Small intestine
Which of the following is a substrate of trypsin?
  • Protein
  • Fat
  • Carbohydrate
  • Amino acid
Smooth muscles are likely to be found in
  • Muscles of legs
  • Muscles of arms
  • Stomach
  • Heart
Carbohydrates are not digested in
  • Buccal cavity
  • Intestine
  • Stomach
  • Duodenum
Which is the first enzyme to mix with food in the digestive tract?
  • Pepsin
  • Cellulase
  • Amylase
  • Trypsin
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