406: Which one of the following statements is not correct ?
(a) All echinoderms are viviparous
(b) Round worm has no circulatory system
(c) In bony fishes, swim bladder is usually present
(d) In cartilaginous fishes, fertilisation is internal
407: When a ship enters a sea from a river, its portion under water will:
(a) Increase
(b) Decrease
(c) Show no change
(d) Increase and decrease alternately
408: Gypsum is added to cement clinker to
(a) Increase the tensile strength of the cement
(b) Bind the particles of calcium silicate
(c) Decrease the rate of setting of cement
(d) Facilitate the formation of colloidal gel
409: Even though an animal is fed with carbohydrate-rich diet, its blood sugar concentration tends to remain constant. This is on account of the fact that in the case of an animal
(a) hormones of pituitary glands control metabolic process
(b) hormones of pancreas cause such a condition
(c) blood sugar is readily absorbed by liver
(d) glucose undergoes autolysis
410: How many members can be nominated to the Lok Sabha by the President?
(a) 2
(b) 4
(c) 5
(d) 12