Tag: digestion and absorption

Questions Related to digestion and absorption

In rabbit, the digestion of cellulose takes place in

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Colon

  2. Ileum

  3. Caecum

  4. Rectum

Show answer
Correct Option: C
Explanation:

In herbivores like rabbit, the symbiotic bacteria and protozoans present in the caecum, help in digestion of cellulose into glucose. So, the digestion of cellulose takes place in caecum by the process of decomposition. This decomposition process is very slow. So, very less amount of cellulose is digested at a time in caecum.

In stomach after physical and chemical digestion, food is called

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Chyme

  2. Chyle

  3. Amino acid

  4. Bolus

Show answer
Correct Option: A
Explanation:

Chyme is a thick semifluid mass of partially digested food and digestive secretions that is formed in the stomach and intestine during digestion.

Which of the following type of enzyme is not matched correctly with the molecule that it breaks down?

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Amylase- Starch

  2. Lipase- Starch

  3. Protease- Proteins

  4. Disaccharidase- Sugars

Show answer
Correct Option: B
Explanation:

Lipases are enzymes found in the small intestine of humans that helps in the breakdown of fats. it is not involved in the digestion of starch.

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?

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Small intestine : $\rightarrow $ Proteins Pepsin Amino acids

  2. Stomach : $\rightarrow $ Fats Lipase Micelles

  3. Duodemum : $\rightarrow $ Triglycerides Trypsin Monoglycerides

  4. Small intestine : $\rightarrow $ Starch Amylase Disaccharide (Maltose)

Show answer
Correct Option: D
Explanation:

Amylase digests complex starch (polysaccharide) molecules into smaller, simpler maltose (disaccharide) molecules. 

Lactase is found in

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Saliva

  2. Bile

  3. Pancreatic juice

  4. Intestinal juice

Show answer
Correct Option: D
Explanation:

Lactase is an enzyme produced by the small intestine, found in the digestive system of humans. It is essential to complete the digestion of whole milk. Lactase breaks down lactose, a simple sugar which gives milk its sweetness. 

Fats in the stomach is inhibited. This inhibition is due to

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Presence of fat

  2. Non stimulation of vagus nerve

  3. Slow digestion of fat

  4. Release of enterogastron

Show answer
Correct Option: C
Explanation:

  •  In the digestive environment, proteins, carbohydrates are initially attacked by enzymes produced by your salivary glands and stomach. And then it attacks fats.
  • However, effective enzymatic breakdown of fats requires emulsification by bile acids, a process that does not occur until fats leave your stomach and enter your small intestine. Hence, Fats in the stomach is inhibited. This inhibition is due to the slow digestion of fat. So, the correct answer is 'Slow
    digestion of fat'.

Assertion  :  The main part of carbohydrate digestion
                      takes place in small intestine.

Reason    :    Here pancreatic amylase converts
                       carbohydrates into lactose


biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. If both the assertion and the reason are true and the reason

    is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is

    not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true

Show answer
Correct Option: C
Explanation:

In small intestine Pancreatic amylase converts starch and dextrose into maltoses and small intestine is main site for digestion of carbohydrates.

Assertion  :    Starch is hydrolyzed by protease to maltose.

Reason      :    Sucrase hydrolyzes sucrose to lactose.


biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. If both the assertion and the reason are true and the reason

    is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is

    not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true

Show answer
Correct Option: D
Explanation:

Starch is hydrolyzed by pancreatic amylase to maltose, isomaltose and dextrose sucrose $\overset{suctase}{\rightarrow}$ glucose and fructose.

Which of the following sugars is absorbed from the small
intestine by facilitated diffusion

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Fructose

  2. Glucose

  3. Sucrose

  4. Lactose

Show answer
Correct Option: A
Explanation:

Glucose and gala dose are absorbed by active transport. Fructoseis absorbed by facilitated diffusion.

Fatty acid and glycerol are first taken up from alimentary
canal by

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. villi

  2. Blood capillaries

  3. Hepatic portal vein

  4. Lymph vessels

Show answer
Correct Option: D
Explanation:

Generally, fatty acids upto a chain length of 10 carbon atom are primarily absorbed through the blood capillaries, but those with higher chain length through lymphatic route (lymph vessels).