156: Fertility of soil can be improved by:

(a) Removing dead earthworms

(b) Adding dead earthworms

(c) Adding living earthworms

(d) Removing living earthworms and adding dead earthworms
157: In which organ of the human body are the lymphocyte cells formed?

(a) Liver

(b) Long bone

(c) Pancreas

(d) Spleen
158: Arrange the following in descending order of their life spans

A. Elephant

B. Horse

C. Tiger

D. Wolf

(a) A, B, C, D

(b) A, C, B, D

(c) C, A, B, D

(d) D, A, B, C
159: Which one of the following is not related to United Nations ?

(a) Multilateral Investment Guarantee Agency

(b) International Finance Corporation

(c) International Centre for Settlement of Investment Disputes

(d) Bank for International Settlements
160: Duncan pass is located between:

(a) North Andaman and South Andaman

(b) North Andaman and Car Nicobar

(c) South Andaman and Car Nicobar

(d) South Andaman and Little Andaman