Question

Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:

a) Both A and R are true, and R is correct explanation of the assertion.

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

c) A is true, but R is false.

d) A is false, but R is true.

Q11. Assertion: After white washing the walls, a shiny white finish on walls is obtained after two to

three days.

Reason: Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen

Carbonate which gives shiny white finish.

(1 Mark)

Q12. Assertion: Light travelling from air into a glass slab bends away from the normal.

Reason: Light moves faster in air than glass slab

(1 Mark)

Answer Q. No 13 - 14 contain five sub-parts each. You are expected to answer any four sub-parts in these

questions.

Q13. Read the following and answer any four questions from 13 (i) to 13 (v)

All living cells require energy for various activities. This energy is available by the breakdown of

simple carbohydrates either using oxygen or without using oxygen.

(i) Energy in the case of higher plants and animals is obtained by

a) Breathing

b) Tissue respiration

c) Organ respiration

d) Digestion of food

(ii)

The graph below represents the blood lactic acid concentration of an athlete during a race of 400 m and

shows a peak at point D.

Lactic acid production has occurred in the athlete while running in the 400 m race. Which of the

following processes explains this event?

a) Aerobic respiration

b) Anaerobic respiration

c) Fermentation

d) Breathing​

Answer 1

Answer:

1) option number third is the right answer.

2) option number one is the right answer.

3) option number third is the right answer.