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To produce 10 kg of catfish, which feeds on algae, approximately how many kg of algae are needed?

A. 10
B. 100
C. 1000
D. 10000

Answer :

To determine how much algae is needed to produce 10 kg of catfish, we need to think about the typical ecological efficiency. Ecological efficiency refers to how much energy is transferred from one trophic level to the next in a food chain.

In many ecosystems, only about 10% of the energy from one trophic level is transferred to the next due to energy loss, primarily as metabolic heat. This is often referred to as the "10% rule."

In this scenario, catfish eat algae. If catfish are the next trophic level after algae, this means that, to produce 10 kg of catfish, we need significantly more algae since only 10% of the algae's mass can be converted into fish mass.

Based on this, to produce 10 kg of catfish, you would typically need approximately 100 kg of algae.

Thus, the correct answer is 100 kg of algae.

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