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Ecosystem

Short Answer Type

41.

Sketch the following pyramids.
(i) Pyramid of number (ii) Pyramid of biomass. (iii) Pyramid of energy.

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42.

Construct a pyramid of biomass, starting with phytoplankton. Label three trophic levels. Is the pyramid upright or inverted? Why?

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43. Why is the pyramid of energy always upright ?

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Long Answer Type

44.

Define ecological pyramids and describe with examples, pyramids of number and biomass.

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One Word Answers

45. By the process of leaching the water soluble inorganic nutrients get precipitated as ?

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46.

Which nature of humus makes it a good reservoir of nutrients?

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Short Answer Type

47.

What is a sere?

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One Word Answers

48.
Most part of energy is lost in which form during the energy flow in the ecosystem?

(i) Pyramid of biomass

(ii) Pyramid of biomass in an aquatic ecosystem is always inverted.

(iii) The biomass primary producer (PP) phytoplanktons is smaller than biomass of zooplanktons. The latter constitute primary consumer (PC). The biomass of carnivores i.e. fish, a secondary consumer (SC) is more than the biomass of primary consumer. Then the pyramid of biomass of aquatic ecosystem is inverted.

Pyramid of Biomass

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