Question

DIRECTION: In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the statements, given below, mark the correct answer as:
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.

1. Assertion: The nitrogen fixing bacteria in leguminous plant nodules live as symbionts.
Reason: They fix atmospheric nitrogen in the soil and in turn receive food and protection from
the plant.

2. Assertion: Elemental oxygen is harmful for some bacteria.
Reason: These bacteria lack some enzyme which are required to survive in presence of
Oxygen.

3. Assertion: Evaporation and transpiration maintain the water level on the earth.
Reason: Evaporation is loss of water from water bodies whereas transpiration is absorption of water from roots of a plant.

Answer 1

1. (a)

2.(a)

3.(d)

Hope it helps