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(a) Explain primary productivity and the factors that influence it.
(b) Describe how do oxygen and chemical composition of detritus control decomposition.
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(a) Primary productivity is defined as the rate of biomass or organic matter produced per unit area by plants during photosynthesis. It is expressed in terms of or kcal .
Factors influencing primary productivity are:
(i) Plant species inhabiting a particular area
(ii) Environmental factors (light., temperature etc.)
(iii) Availability of nutrients and photosynthetic capacity of plants.
(b) Decomposition is largely an oxygen requiring process. The rate of decomposition is controlled by chemical composition of detritus and climatic factors. In a particular climatic condition, decomposition rate is slower if detritus is rich in lignin and chitin and quicker if detritus is rich in nitrogen and water soluble substances like sugars. Lack of oxygen inhibits decomposition resulting in build up of organic material.
Factors influencing primary productivity are:
(i) Plant species inhabiting a particular area
(ii) Environmental factors (light., temperature etc.)
(iii) Availability of nutrients and photosynthetic capacity of plants.
(b) Decomposition is largely an oxygen requiring process. The rate of decomposition is controlled by chemical composition of detritus and climatic factors. In a particular climatic condition, decomposition rate is slower if detritus is rich in lignin and chitin and quicker if detritus is rich in nitrogen and water soluble substances like sugars. Lack of oxygen inhibits decomposition resulting in build up of organic material.
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Question Text | (a) Explain primary productivity and the factors that influence it. (b) Describe how do oxygen and chemical composition of detritus control decomposition. |
Topic | Ecosystem |
Subject | Biology |
Class | Class 12 |
Answer Type | Text solution:1 |
Upvotes | 122 |