Question

Assertion: Fresh milk in which baking soda is added, takes a longer time to set as curd.

Reason: Baking soda decreases the pH value of fresh milk to below 6.

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

D. A is False but R is true
32. Assertion: Decomposition of vegetable matter into compost is an endothermic reaction.

Reason: Decomposition reaction involves breakdown of a single reactant into simpler

products.
A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

D. A is False but R is true

33. Assertion: Resins and gums are stored in old xylem tissue in plants.

Reason:Resins and gums facilitate transport of water molecules.

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

D. A is False but R is true
34. Assertion: Sky appears blue in the day time.

Reason: White light is composed of seven colours.
A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

D. A is False but R is true
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Answer 1

Answer:

ans is a both are correct

Explanation:

and correct explanation of assertion

Answer 2

The correct answers are as follows:

31. Option C

• The baking soda increases the pH value of milk above 6. Milk is alkaline. When baking soda is added to milk, it balances the acids produced in milk while setting into curd. Thus, it takes a longer time to turn into curd.

32. Option B

• Decomposition is a process of breakdown of substances into simple matters. However, it is an endothermic process because it absorbs energy to break down into smaller particles.

33. Option C

• Resins and gums are indeed stored in the old xylem tissues. But they do not help in the transport of water molecules. They are secreted by the plants to heal up their tears and injuries.

34. Option B

• Both the statements are correct. However, the reason does not complement the assertion. The blue color of the sky is due to the dispersal of the blue color present in the white light.