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Question
In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass? Justify your answer.
GRASS → GRASS HOPPER → FROG → SNAKE → PEACOCK
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Solution
According to ten percent law, only ten percent of energy is transferred to each trophic level from the lower trophic level.
Total amount of energy from the snake = A = `"A" xx 10/100` = 2J
Or A = 20 J
Total energy from the frog = B = `"B" xx 10/100 = 20`J
Or B = 200 J
Total energy from the grasshopper,
C = `"C" xx 10/100` = 200 J
Or C = 2000 J
Total energy from the grass,
D = `"D" xx 10/100` = 2000 J
Or D = 20000 J
\[\ce{\underset{(20000 J)}{GRASS} -> \underset{(2000 J)}{GRASS HOPPER} -> \underset{(200 J)}{FROG} -> \underset{(20 J)}{SNAKE} -> \underset{(2J)}{PEACOCK}}\]
This means, the amount of energy present in the grass is 20000 J.
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