Can we survive only on raw, leafy vegetables/grass? Discuss.

3

(a)

Name the various components of food and their simpler forms.

3

(a)

Boojho and Paheli were eating their food hurriedly so that they could go out and play during the recess. Suddenly, Boojho started coughing violently. Think of the reasons, why he was coughing and discuss with your friends?

3

(a)

Gastric glands in stomach release hydrochloric acid, enzyme pepsin and mucus. What will happen if mucus is not secreted by the gastric glands?

3

(a)

The swallowed food moves downwards in the alimentary canal. Explain.

3

(a)

Explain how assimilation is different from absorption.

3

(a)

Is there any role of liver in digestion of fats? Explain.

3

(a)

Cellulose rich food substances are good source of roughage in human beings. Justify.

3

(a)

Recall and name the main organs of the digestive system in our body.

3

(a)

Solve the crossword given as Figure:

                         Across
1. Cream-coloured digestive gland
3. Undigested excretory solid residues
4. Organ that mixes saliva with the food
5. Point of defecation
7. Stored in gall bladder.
10. Finger-like outgrowth in the small intestine
13. Kind of taste buds
14. Kills bacteria in the stomach
                           Down
2. Feeds with the help of pseudopodia
6. Total number of molars in one jaw of an adult
8. largest gland
9. Watery secretion in the mouth
11. A ruminant
12. Form of food chewed by ruminants.

3

(a)

Write three functions of tongue

3

(a)

Draw a labelled diagram of human digestive system to show various organs associated with it.

3

(a)

What happens with the carbohydrates like starch in our body which are taken by us?

3

(a)

Write various components of food.

3

(a)

As Rishab is fond of eating chocolates, his mother always discusses about the importance of teeth in our life and to take care of it. Rishab is reluctant to follow the instructions given by his mother. One day while bitting guava he saw blood patch on it. He became afraid and asked his mother the following questions:
(i) Which is the problem coming in my teeth which cause toothache?
(ii) How can I get rid of it?
(iii) Which value is promoted by Rishab's mother?

3

(a)