50. Tetrodotoxin is a potent poison that
(a) erodes blood vessels
(b) blocks conduction of nerve impulses causing respiratory paralysis
(c) produces damage to the kidneys
(d) produces intestinal bleeding
Ans: (b)
51. Xerophthalmia is a deficiency disease. Deficiency of _________ causes it.
(a) vitamin A
(b) vitamin B
(c) vitamin C
(d) vitamin E
Ans: (a)
52. Calcium and phosphorus assimilation will depend on sufficient intake of
(a) vitamin B complex
(b) vitamin D
(c) vitamin A
(d) vitamin C
Ans: (b)
53. Vitamin D deficiency leads to
(a) sterility
(b) pellagra
(c) rickets
(d) capillary fragility
Ans: (c)
54. Kwashiorkar is characterised by
(a) dermatitis, changes in hair pigments and retarded brain growth
(b) excretion of creatine in excess
(c) tyrosinosis and alcaptonuria
(d) None of these
Ans: (a)
55. Kwashiorkar is a deficiency disease
(a) due to poor intake of proteins
(b) due to poor intake of carbohydrates
(c) due to (a) and (b)
(d) due to poor intake of lipids
Ans: (a)
56. Modern classification of the living world recognise ___________ kingdoms.
(a) two
(b) three
(c) four
(d) five
Ans: (d)
57. Pearl is secreted by the __________ of the pearl oyster.
(a) foot
(b) mantle
(c) gills
(d) None of these
Ans: (b)
58. The country where commercial production of cultured pearls is undertaken on large scale is
(a) India
(b) Mexico
(c) Netherlands
(d) Japan
Ans: (d)
59. Spiders can take only
(a) solid food
(b) liquid food
(c) plant juice
(d) flesh of dead animals
Ans: (b)
60. Lizards, snakes, crocodiles and turtles belong to the class
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