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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- CSIR NET
- Life Sciences
Following are certain statements regarding energy efficiencies of ectotherms and endotherms :
(A) Ectotherms have high assimilation efficiency but low production efficiency.
(B) Ectotherms have low assimilation efficiency but high production efficiency.
(C) Endotherms have high assimilation efficiency but low production efficiency.
(D) Endotherms have low assimilation efficiency but high production efficiency.
Which one of the following represents the combination of correct statements ?
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Eduncle Best Answer
Energy efficiencies were calculated for individuals of half the adult mass, both ectotherms and endotherms convert about the same proportion of food energy into somatic growth although for a given body mass the latter expend about 10 times more aerobic power than the former. On the other hand, early in life, during the period of maximum growth, ectotherms channel a 2-3 times greater percentage of metabolic energy into growth than endotherms. Even greater becomes the difference between these two groups if we consider the relative cost of reproduction. It can be shown that, weight by weight, nematodes, fish, birds and mammals require almost the same amount of energy for the production of offspring-, roughly 250 kJ per day and kg of eggs, hatchlings or litter. However, whereas the cost of producing offspring represents only 2%-6% of the total metabolizable energy of an endotherm, a fish has to spend 35%, a nematode nearly everything it has for this purpose.