In question 23 answer is 10J or 100J

Dear student,
Please find below the answer:

The correct answer is 100 J.
At each trophic level, about 10% of the energy of the previous trophic level is passed to the next food chain. This is known as 10% law. Now according to this law only 10% of the energy is transferred to each trophic level. 

So if 10000 joules of energy is available to grass, then to primary consumer (deer) only 1000 joules would be available and to the secondary consumer (Lion) 10% of the energy of the primary producer would be transferred which is 100 joules. 

Hope this helps.
Regards.

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