Question

calculate the energy available to the lion in the following food chain if.plants have 20,000 joules of energy available from the sun. plants to deer to.lion

Answer 1

lin Jobcy asked in Science

plz calculate amount of energy available through lion in the food chain Plants-->deer -->lion, if plants have 20,000J of energy from the sun.

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Preetibala Badoule answered this
26 helpful votes in Science, Class XII-Science

1% energy 20,000 from sun to plant is 200 105 of energy from plant to deer is 20 than10%from deer tolion is 2

Answer 2

Answer:

(i) Plants can trap only 1% of the sun's energy falling on them. Now , 1% of       20000 J is 200 J, so the plants have actually 200 J of energy available in them as food (The 10 per cent law does not apply at this stage).

(ii) The plants are eaten up by deer. Now, according to 10 per cent law, 10% of 200 J, that is 20 J of energy will be available in deer as flesh food.

(iii) The deer will transfer 10% of its 20 J energy to the lion. Thus, The food energy available to the lion will be 10% of 20 J which comes to 2 J.

The above results can be shown more clearly as follows :

Sun 20,000J(1%absorbed)

Plant200J−→−−−−−−10% of 200JDeer20J−→−−−−−10% of 20JLion2J