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31. How will you calculate net primary productivity ?

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32. Name the commonly studied ecological pyramids.

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33. Name the two types of nutrient cycles?

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34. Which ecological pyramid is always upright ?

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35.

The entire sequence of communities that successively change in a given area are called

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36. The other name for nutrient cycling is

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37. State what does ‘standing crop’ of a trophic level represent.

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38. Distinguish between the following :

(a) Grazing food chain and detritus food chain

(b) Production and decomposition

(d) Food chain and food web

(e) Litter and detritus

(f) Primary and secondary productivity.

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39. Give an account of factors affecting the rate of decomposition.

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Trophic levels in an ecosystem.

Diagrammatic representation of trophic levels in an ecosystem.

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