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121. In endothermic organisms, the body temperature is
A. Constant
B. Often higher than that of environment
C. Not allowed to become low due to insulating devices
D. All the above
Explanation:
122. Energy transfers or transformations are never 100% efficient. This is due to
A. Entropy
B. Homeostasis
C. Aggregation
D. Adaptation
Explanation:
123. Universe is
A. Closed system
B. Open system
C. Receiving constant supply of energy
D. Dissipating energy continuously
Explanation:
124. Number of rice varieties developed by ancient Indians was
A. 1,00,000
B. 40,000
C. 21,000
D. 10,000
Explanation:
125. Organisms which are more economical and conserve energy are
A. Ectothermic
B. Homeothermous
C. Endothermic
D. Sword fishes
Explanation: