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Q.

Select the correct statement.

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a

Carbon cycle is imperfect cycle while phosphorus cycle is perfect cycle.

b

Ten percent law was proposed by Odum in 1942.

c

Grazing food chain helps in releasing inorganic nutrients to the cycling pool.

d

Seral community is a transitional community which develops in an area during succession.

answer is D.

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Detailed Solution

The phosphorus cycle is considered as an imperfect cycle as the phosphorus that originates from a source does not go back to it.

Lindemann proposed the Ten Percent Law for energy transfer in an ecosystem. 

Detritus food chain starts with dead organic matter where the organic matter is decomposed to its inorganic content and made available for the producers in the ecosystem.

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