641: With reference to the work of human kidney, consider the following statements:
1. After the waste is removed in the kidney, the cleaner blood is sent back through renal artery.
2. From Bowman's capsule, the filtered liquid passes through tiny tubes where much of the glucose is reabsorbed and sent back to the blood in the renal vein.
Which of these statements is/the correct?
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
642: A redistribution of income in a country can be best brought about through
(a) progressive taxation combined with progressive expenditure
(b) progressive taxation combined with regressive expenditure
(c) regressive taxation combined with regressive expenditure
(d) regressive taxation combined with progressive expenditure
643: Which feature of some, species of blue-green algae helps promote them as bio-fertilizers?
(a) They convert atmospheric methane into ammonia which the crop plants can absorb readily
(b) The induce the crop plants to produce the enzymes which help convert atmospheric nitrogen to nitrates
(c) They have the mechanism to convert atmospheric nitrogen into a form that crop can absorb readily
(d) The induce the roots of the crop plants to absorb the soil nitrates in larger quantities
644: The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?
(a) Ice is a bad conductor of heat
(b) Since the surface of the lake is at the same temperature as the air, no heat is lost
(c) The density of water is maximum at 4 degree celcius
(d) None of the statements (a), (b) and (c) given above is correct.
645: With reference to Mian Tansen, which one of the following statements is not correct?
(a) Tansen was the title given to him by Emperor Akbar.
(b) Tansen composed Dhrupads on Hindu gods and goddesses.
(c) Tansen composed songs on his patrons.
(d) Tansen invented many Ragas.