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Question

Given that plants convert 1% of the light energy they receive into new plant material. Calculate the energy available for the vole in the food chain given below, where the primroses receive 100000 units of light energy.
Primrosevoleweaselowl.


Your Answer
A
10000 units
Your Answer
B
1000 units
Correct Answer
C
100 units
Your Answer
D
10 units

Solution

The correct option is C 100 units
At each trophic level 10 percent of the energy is transferred. This is known as the Lindema's Law of Energy Transfer. Vole is at the second trophic level in this food chain. Plants will take 1% of 100000 units, i.e., plants will have 1000 units of energy. When a vole eats the plants only 10 percent of the energy in plants will be transferred, i.e., 10 percent of 1000 units. So the vole gets 100 units of energy.

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