Short Answer TypeApart from being a part of the food chain, predators play other important roles. Mention any two such roles supported by examples.
How are productivity, gross productivity, net primary productivity and secondary productivity interrelated?
Long Answer TypeShort Answer TypeLong Answer TypeExplain how does:
(a) a primary succession start on a bare rock and reach a climax community?
(b) the algal bloom eventually choke the water body in an industrial area?(a) Explain primary productivity and the factors that influence it.
(b) Describe how do oxygen and chemical composition of detritus control decomposition?
(a) The amount of biomass produced per unit area over a time period by plants during photosynthesis is defined as the primary productivity. It is expressed as weight or energy. Productivity can be mainly divided into gross primary productivity (GPP) and net primary productivity (NPP). GPP is the rate of production of organic matter during photosynthesis.
Primary productivity is directly proportional to the amount of carbon dioxide, sunlight and water. It is inversely proportional to respiratory losses. NPP = GPP - Respiratory losses (R)
(b) Decomposition is an oxygen consuming process thus it is directly proportional to the concentration of the oxygen in the environment. It is controlled by the chemical composition of detritus and climatic conditions. The decomposition rate decreases when the detritus is rich in lignin and chitin while it is quicker if the detritus contains nitrogen and water-soluble substances such as sugars.
Short Answer TypeWith the help of a flow chart, show the phenomenon of biomagnification of DDT in an aquatic food chain.
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