Question

Which statement BEST compares how matter and energy move among organisms in the food
chain?
A
Matter cycles among organisms and energy flows among organisms in the
system, and both matter and energy are conserved.
B
Matter flows among organisms and energy cycles among organisms in the
system, but only matter is conserved.
с
Matter and energy both cycle among all organisms in the system, and both
matter and energy are conserved.
D
Matter and energy both flow among all organisms in the system, but only
energy is conserved.

Answer 1

A food web is a description of all the food chains in an ecosystem. In a food web, energy and living matter move up the trophic levels.

• The statement that BEST compares how matter and energy move among organisms in the food chain is matter flows among organisms and energy cycles among organisms in the system, but only matter is conserved (Option B).

• At each step up the food chain, approximately 90% of the energy is lost in the form of heat.

• Nutrients and living matter are passed between trophic levels and between the organisms and the physical environment, but it is conserved.

• All matter passes through the food chain, eventually decomposing to form new substances which can be used by new organisms.

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