Tag: digestive glands and their secretions

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

Emulsification of fats is due to 

  1. Pepsin

  2. Cholesterol

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Bile salts (of bile) plays a very important role in the digestion of fats. As fats are insoluble in water, they enter the intestine as drops within the watery chyme. The bile salts, which are partly lipid-soluble and partly water-soluble, emulsify the fat particles and, as a result, the fat-drops acquire a greater surface area. The enzyme lipase, then acts upon these fat-drops and allows its digestion into glycerol and fatty acids. 

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

Glucose is transported to cell by 

  1. ${ Na }^{ + }$ Symport
  2. ${ K }^{ + }$Symport
  3. ${ Na }^{ + }$ Antiport
  4. ${ K }^{ + }$Antiport
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbohydrates are hydrolysed by concerning enzymes and converted into monosaccharides like glucose and fructose. Monosaccharides are absorbed via the capillary blood with in the villus to finally reach into portal vein. Absorption of glucose molecules occurs along with, Na+ by active import. Fructose is absorbed passively through facilitated diffusion.

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

In rabbit, the digestion of cellulose takes place in

  1. Colon

  2. Ileum

  3. Caecum

  4. Rectum
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Amylase- Starch

  2. Lipase- Starch

  3. Protease- Proteins

  4. Disaccharidase- Sugars
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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?

  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)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

Lactase is found in

  1. Saliva

  2. Bile

  3. Pancreatic juice

  4. Intestinal juice
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

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

  1. Presence of fat

  2. Non stimulation of vagus nerve

  3. Slow digestion of fat

  4. Release of enterogastron
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

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

Reason    :    Here pancreatic amylase converts
                       carbohydrates into lactose


  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

Assertion  :    Starch is hydrolyzed by protease to maltose.

Reason      :    Sucrase hydrolyzes sucrose to lactose.


  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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