Question

1. What type of nutrition does an amoeba have? 1

2. What are villi ? State its function also. 2

3. (i) What is the role of acid in stomach ? 2

(ii)What is emulsification of fats?

4. (i)Define Rancidity. 2

(ii) How will you prevent food from getting spoiled by the above said process.

5. Define term decomposition reaction .Give an example of each thermal

decomposition and electrolytic decomposition reaction . 3

6. (a) Draw well labelled diagram of human digestive system .

(b) Name the substances on which the following enzymes act in the human digestive

system: 1) Trypsin 2) Amylase 3) Pepsin 4) Lipase 5

7. (a) Why is small intestine in herbivores longer than in Carnivores?

(b) What will happen if mucus is not secreted by the gastric glands?

(c) Name the pigment which can absorb sunlight energy.

(d) Write the function of liver in human digestive system. 5

8. A) What is nutrition and why is it necessary for the Human body?

b) What causes movement of food inside the alimentary canal?

c) Write the function of Pancreas in human digestive system. 5​

Answer 1

Answer:

1)holozoic

2)villi are small finger like projections present in the small intestine

function: to increase surface area in the small intestine and to absorb nutrients from the food

3) i) HCLdissolves bits of food and creates an acidic medium , Pepsin is activated which is a protein digesting enzyme

ii) breaking down of large fat globules into small globules

Answer 2

Answer:

(1) amoeba have saprophytic type of nutrition.

(2) villi are the finger like projection present in small intestine which helps in increasing the surface area.

(3) acid percent in stomach is helpful in killing the unwanted and harmful microorganisms. also helpful in digestion.

(7)

1. small intestine in herbivorous longer than carnivorous because an hard material named "cellulose "is present in plants. so,to breakdown cellulose herbivorous have small intestine longer compared to carnivorous.
2. mucus is a thin layer present in stomach surface which protects stomach from reacting with hydrochloric acid which is released during digestion.
3. chlorophyll is the pigment which can absorb sunlight energy.
4. the function of liver is to release the digestive enzymes for digestion. also liver stores the acid secreted by gallbladder.

(8) a, nutrition is a method by which energy is produced in body of any organism.

b, saliva causes movement of food inside the alimentary canal.

c, pancreas releases the pancreatic juice which is a kind of digestive juice, which is helpful in digestion.

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