a) Explain primary productivity and the factors that influence it. (b) Describe how do oxygen and chemical composition

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Q 2665623565.     a) Explain primary productivity and the factors that influence it.
(b) Describe how do oxygen and chemical composition of detritus control
decomposition.
OR
(a) What is El Nino effect? Explain how it accounts for biodiversity loss.
(b) Explain any three measures
CBSE-12th 2011

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