NCERT Class 10 Chapter 7 Life Process CBSE Board Sample Problems Very Short Answer

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Question

In which cell organelle does respiration occur?

Solution

Respiration occurs in the mitochondria of a cell.

Question

Why carbon dioxide is mostly transported in dissolved form?

Solution

Carbon dioxide is more soluble in water than oxygen that’s why it is transported in soluble form.

Question

Enlist the site of synthesis and storage of bile.

Solution

Site of synthesis-liver, site of storage-Gall bladder.

Question

If salivary amylase is lacking in the saliva, which event in the mouth cavity will be affected?

Solution

Starch breaking down into sugars.

Question

Define photolysis.

Solution

The phenomenon of breaking down of water molecule using solar energy absorbed by chlorophyll molecules is known as photolysis.

Question

Why does lack of oxygen in muscles often lead to cramps among cricketers?

Solution

This s due to the conversion of pyruvate to lactic acid in the absence of oxygen.

Question

Why do the walls of trachea not collapse when there is less air in it?

Solution

Tracheal walls do not collapse when there is less air ¡n it because it is supported by rings of cartilage.

Question

What ¡s ascent of sap?

Solution

Absorbed water from the soil also contain dissolved minerals and hence it is called sap. This sap moves upwards due to the ‘transpiration pull’ developed in the xylem elements. Thus, transportation of sap from roots to the leaves at the top is called ascent of sap.

Question

What is osmoregulation?

Solution

Osmoregulation is the maintenance of optimum concentration of water and salts in the body fluids.

Question

Name the chemical which is used to test starch.

Solution

Ans: Iodine

Question

In photosynthesis, which substances are used up, which are produced and which are necessary, but remain unchanged after the reaction?

Used up Produced Remain Unchanged
Used up Produced Remain Unchanged

Used up

Produced

Remain Unchanged

A

Carbon dioxide

Water

Oxygen

B

Chlorophyll

Carbon dioxide

Water

C

Oxygen

Starch

Cellulose

d

Water

Oxygen

Chlorophyll

Solution

Ans : (d) Used up-Water, Produced-Oxygen, Remain Unchanged-Chlorophyll

Question

In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).

Assertion (A) is true but reason(R) is false.

Assertion (A) is false but reason(R) is true.

Assertion: Transpiration cools leaf surface.

Reason: Transpiration helps in translocation of sugar in plants.

Solution

Ans: (3)

Question

In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).

Assertion (A) is true but reason(R) is false.

Assertion (A) is false but reason(R) is true...

Assertion: Villi are present on the internal wall of intestine.

Reason: Villi absorb digested food.

Solution

Ans :(1 ‘)

Question

Choose the correct option.

What is the mode of nutrition ¡n fungi?

a) Autotrophic

(b) Heterotrophic

(c) Saprophytic

(d) Parasitic

Solution

Ans: (c) Saprophytic

Question

Choose the correct option.

Vocal cords occur in:

a) pharynx

(b) Glottis

(c) Bronchial tube

(d) Larynx

Solution

Ans :(d) larynx

Question

Fill in the blanks:

Ultra filtration takes place in _____ _____ of the nephron.

Solution

Ans: Glomerulus

Question

Fill in the blanks:

____________ is involved in breakdown of glucose to produce energy for metabolic activities in a cell.

Solution

Ans - Mitochondria

Question

What happens to the glucose present in the filtrate when ¡t reaches the proximal convoluted tubules?

Solution

The glucose present in the filtrate is reabsorbed when it reaches the proximal convoluted tubules

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