Q42 of 163 Page 242

Which of the following limits the number of trophic levels in a food chain?

Since only 10% of energy is transferred at each trophic level, the higher trophic level get very low amount of energy which is not sufficient for the organisms to sustain life. So, the trophic level gets restricted to amount of energy available at which the organisms at that trophic level can sustain life.

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40

Which pollutant released into the air during refrigeration and air-conditioning is the greatest contributor to the depletion of ozone layer?

 41

In the food chain given below, if the amount of energy available at fourth trophic level is 5 kJ, what was the energy available at the producer level?

GrassGrasshopper Frog Snake Hawk

 43

What percentage of sun's energy falling on the leaves of green plants is utilized by the plants in the process of photosynthesis and stored as chemical energy of food?

 44

The depletion of ozone layer in the upper atmosphere is mainly due to the emission of: