Question

Consider the energy pyramid.

Energy Pyramid

Which statement best summarizes what happens to energy as it flows through the food chain?
A.
The amount of energy transferred between trophic levels increases up the food chain.
B.
The amount of energy transferred between trophic levels decreases up the food chain.
C.
The amount of energy transferred between any two trophic levels of a food chain is the same.
D.
The amount of energy at each trophic level of a food chain is independent of the other levels.

Answer 1

Explanation:

B. The amount of energy transferred between trophic levels decreases up the food chain.

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Answer 2

Option B - The amount of energy transferred between trophic levels decreases up the food chain.

Energy Pyramid

• An energy pyramid is a graphical representation of energy situated, transferred, and lost at each level of the trophic chain.
• According to the theory of Energy Transfer, when level B in the food chain consumes level A, only 10% of the energy is transferred.
• The majority of the energy i.e. 905 is dissipated in the form of heat and thus lost.

Example : Let the 3 trophic levels Food Chain be the following,

Grass ----> Deer ------> Lion

According to the law of Energy Transfer in food chain levels:

• When deer consume grass, only 10% of the energy of grass is transferred to deer. The rest of the 90% of energy is lost in the form of heat.
• Similarly, when the lion consumes deer, only 10% of the energy of the deer is transferred to the lion. The rest majority 90% of the energy is lost in the form of heat.

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