NCERT Solutions for Class 11 Biology Chapter 16

Digestion and Absorption Class 11

Chapter 16 Digestion and Absorption Exercise Solutions

<< Previous Chapter 15 : Plant Growth and Development Next Chapter 17 : Breathing and Exchange of Gases >>

Exercise : Solutions of Questions on Page Number : 267

Q1 :  

Choose the correct answer among the following:

 (a) Gastric juice contains

    (i) pepsin, lipase and rennin

    (ii) trypsin lipase and rennin

    (iii) trypsin, pepsin and lipase

    (iv) trypsin, pepsin and renin

 (b) Succus entericus is the name given to

    (i) a junction between ileum and large intestine

    (ii) intestinal juice

    (iii) swelling in the gut

    (iv) appendix


Answer :

Answer (a): (i) Pepsin, lipase, and rennin

Gastric juice contains pepsin, lipase, and rennin. Pepsin is secreted in an inactive form as pepsinogen, which is activated by HCl. Pepsin digests proteins into peptones. Lipase breaks down fats into fatty acids. Rennin is a photolytic enzyme present in the gastric juice. It helps in the coagulation of milk.

 Answer (b): (ii) Intestinal juice

Succus entericus is another name for intestinal juice. It is secreted by the intestinal gland. Intestinal juice contains a variety of enzymes such as maltase, lipases, nucleosidases, dipeptidases, etc.

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Q2 :  

Match column Iwith column II

Column I

Column II

(a)

Bilirubin and biliverdin

(i)

Parotid

(b)

Hydrolysis of starch

(ii)

Bile

(c)

Digestion of fat

(iii)

Lipases

(d)

Salivary gland

(iv)

Amylases


Answer :

Column I

Column II

(a)

Bilirubin and biliverdin

(ii)

Bile

(b)

Hydrolysis of starch

(iv)

Amylases

(c)

Digestion of fat

(iii)

Lipases

(d)

Salivary gland

(i)

Parotid

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Q3 :  

Answer briefly:

(a) Why are villi present in the intestine and not in the stomach?

(b) How does pepsinogen change into its active form?

(c) What are the basic layers of the wall of alimentary canal?

(d) How does bile help in the digestion of fats?


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Q4 :  

State the role of pancreatic juice in digestion of proteins.


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Q5 :  

Describe the process of digestion of protein in stomach.


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Q6 :  

Given the dental formula of human beings


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Q7 :  

Bile juice contains no digestive enzymes, yet it is important for digestion. Why?


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Q8 :  

Describe the digestive role of chymotrypsin. What two other digestive enzymes of the same category are secreted by its source gland?


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Q9 :  

How are polysaccharides and disaccharides digested?


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Q10 :  

What would happen if HCl were not secreted in the stomach?


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Q11 :  

How does butter in your food gets digested and absorbed in the body?


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Q12 :  

Discuss the main steps in the digestion of proteins as the food passes through different parts of the alimentary canal.


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Q13 :  

Explain the term thecodont and diphyodont.


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Q14 :  

Name different types of teeth and their number in an adult human.


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Q15 :  

What are the functions of liver?


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<< Previous Chapter 15 : Plant Growth and Development Next Chapter 17 : Breathing and Exchange of Gases >>

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