1. The cause of trees shedding leaves in winter is:
(a) the preparation of trees in England for winter snowfall.
(b) the preparation of trees in India for summer heat.
(c) to prevent loss of water which becomes scarce.
(d) the trees take rest after the activity of summer

Directions: Questions 2 to 5 consist of two statements, one labeled the ‘Assertion A’ and the other labeled the ‘Reason R’. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of Assertion. Select your answers from the codes given below.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true but R is not a correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

2. Assertion (A): Blood group ‘O’ is a universal donor.
Reason (R): Blood type ‘O’ has both antigen A and B.

3. Assertion (A): The air is purified in the nose. Reason
(R): The nasal cavity contains hairs and mucous membrane.

4. Assertion (A): Nucleus is the control centre of cell.
Reason (R): Nucleus synthesize various enzymes which regulate various metabolism.

5. Assertion (A): DNA fingerprinting is used to identify perpetrators of violent crimes, mainly murder and rape.
Reason (R): DNA fingerprinting can be carried out with minute quantities of DNA as might be found in a single strand of hair.

Answers