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10% Law

b How much en...

Question

(b) How much energy will be available to hawks in the food chain comprising hawk, snake, paddy and mice, if 10,000 J of energy is available to paddy from the sun?

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Solution

Arranging the given organisms in a food chain we get, Paddy → Mice → Snake → Hawk According to the ten percent law, only 10% of the energy is available to the organism in the succeeding trophic level.

So, if 10,000 J of energy is available to paddy, only 10% of it will be available to the mice.

Thus, the mice will receive 1000 J of energy.

Similarly, the snake will receive 100 J of energy and the hawk will get 10 J of energy.

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Food chain: wheat → rat → snake → hawk
To which of the two consumers, snake or hawk, will more energy (per cent) be available and why?

Q. (a) Name and state the law given by Lindeman which tells us how much energy entering a particular trophic level of organisms is available for trasnsfer to the next higher trophic level.
(b) How much energy will be available to hawks in the food chain comprising hawk, snake, paddy and mice, if 10,000 J of energy is available to paddy from the sun?

Q. In the following food chain, plants provide

500 J

of energy to rats. How much energy will be available to hawks from snakes?

P l a n t s \to R a t s \to S n a k e s \to H a w k s

Q. (b) Consider the following food chains :

(i) Plants → Mice → Snakes → Hawks
(ii) Plants → Mice → Hawks

If energy available at the producer level in both the food chains is 100 J, in which case will hawks get more energy as food and by how much? Justify your answer.

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