16: Triple Antigen does not immunise against:
(a) Diphtheria
(b) Tetanus
(c) Typhoid
(d) Whooping cough
17: How many different triangles are there in the figure shown above?
(a) 28
(b) 24
(c) 20
(d) 16
18: The Alpine vegetation in the western Himalayas is found only up to a height of 3000 metres, while in the eastern Himalayas it is found up to a height of 4000 metres,. The reason for this variation in the same mountain range is that
(a) eastern Himalayas are higher than western Himalayas
(b) eastern Himalayas are nearer to the Equator and sea coast than western Himalayas
(c) eastern Himalayas get more monsoon rainfall than the western Himalayas
(d) eastern Himalayan rocks are more fertile than the western Himalayan rocks
19: On a half-moon night the angle between the moon and the sun when measured from earth is about
(a) 45°
(b) 60°
(c) 90°
(d) 180°
20: Widespread resistance of malarial parasite to drugs like chloroquine has prompted attempts to develop a malarial vaccine to combat malaria. Why is it difficult to develop an effective malaria vaccine ?
(a) Malaria is caused by several species of Plasmodium
(b) Man does not develop, immunity to malaria during natural infection
(c) Vaccines can be developed only against bacteria
(d) Man is only an intermediate host and not the definitive host