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51. State the difference between Biotic and Abiotic components of ecosystem.

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52.

Explain the meaning of food web .

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53. Explain the terms standing crop, biomass and standing state.

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54. Describe the phosphorus cycle.

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55.

Give a graphic representation of carbon cycle in nature.

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56. Name the components of an ecosystem.

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The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called primary productivity.

It is expressed in terms of gm^-2yr^-1 or kcal m^-2 yr^-1. Primary productivity depends upon a number of environmental factors like :

(a) Availability of nutrients which varies in different types of ecosystem.

(b) Photosynthetic capacity of plants.

(d) Environmental factors.

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58. Define decomposition and describe the processes and products of decomposition.

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59.

Give an account of energy flow in an ecosystem.

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60. Write important features of a sedimentary cycle in an ecosystem.

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