Question

A rose bush contains 100kJ/m2/year of energy and only 10% of this energy is passed on at each trophic level of the food chain

How much energy will be passed on the greenfly?Show all calculations

Answer 1

Explanation:

According to the 10 percent law, only 10% of the energy is transferred to each trophic level from its lower trophic level. If 10,000 joules of energy is available to the producer, then only 1000 joules of energy will be available to the primary consumer and only 100 joules of energy will be available to the secondary consumer. The energy available with the tertiary consumer will be 10 joules of energy.

Answer 2

Answer:

The energy passed on the greenfly is $10kJ/m^2/year$.

Explanation:

• Energy is transferred along food chains from one trophic level to the another trophic level in an ecosystem.
• The amount of energy transfer from one trophic level to the next along the food chain is explained through the pyramid of energy.
• According to 10 percent law, as proposed by Lindeman, only 10% energy transfer will be transferred to the next trophic level.
• The amount of available energy decreases from one trophic level to the next.
• The rest 90% of the energy is transferred as heat.

Given the energy in rose bush is $100kJ/m^2/year$.

Only one trophic level is given that is the energy passed on the greenfly.

Thus the 10% of the given energy is

$100\times \dfrac{10}{100}=10kJ/m^{2} /year$

Therefore, the energy passed on the greenfly is $10kJ/m^2/year$.

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