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966. Desert plants would be characterised by :
A. vivipary
B. aerenchyma
C. aerial roots
D. sunken stomata
Explanation:
967. Which of the following statements are true in relation to transpiration and water movements in plants ?1. Removing all the levels from a plant will reduce the flow of water up the stem.2. Covering both sides of a leaf with a plastic film will reduce both stomatal and cuticular transpiration.3. Injecting detergents (which lower the surface tension of water) into the xylem of tree trunk could prevent water from reaching the upper branches.4. Along most of its route through a plant, water moves by diffusion either along cell walls or across protoplasts.
A. 1, 2 and 3
B. 1, 2 and 4
C. 1, 3 and 4
D. 2, 3 and 4
Explanation:
968. Which of the following metals can displace hydrogen from dilute acides ?
A. Zinc
B. Gold
C. Copper
D. Silver
Explanation:
969. If the earth were 3 times as far from the sum as it is now, how would the gravitational attraction compare with its present value ?
A. The gravitational attraction would be 9 times its present amount
B. The gravitational attraction would be double its present amount
C. The gravitational attraction would be 1/9 of its present amount
D. None of the above would be true
Explanation:
970. In the balanced dietaries for a day of an adult working man, weights of carbohydrate food and total protein food (both superior and inferior) should be in order of :
A. 420 gm and 420 gm respectively
B. 420 gm and 600 gm respectively
C. 600 gm and 420 gm respectively
D. 600 gm and 600 gm respectively
Explanation:
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