Question

How much energy will be available to man in the food chain given below if 100000 joules of energy is available from the sun to producers? Justify your answer. Plant- goat- man

Answer 1

1000 joules. since there is a law that the energy passing onto the other levels is reduced by 90% and only 10% of energy is passed..as the energy is used by the organisms in each trophic level. 

Answer 2

100,000 Joules of energy for the plant(producer) → 10000J for goat(primary consumer) → 1000JMan(Secondary consumer) → 100J Tertiary Consumer

Explanation:

• In the food chain, each lower trophic level organism receives 10% of the previous level.
• If the producer avails 1,00,000 J of energy, it's 10% i.e. '10,000 J' would be available to the primary consumer.
• Similarly, the secondary consumer would avail 10% of the energy available to the secondary consumer(man) i.e. 1000(10,000 * 10/100) and the tertiary consumer will have 100J of energy.

Learn more: Food Chain

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