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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?

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Short Answer Type

49. What are the causes of ecological succession ?

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50. Describe the components of an ecosystem.

Ecosystem. A stable, self-supporting ecological unit resulting from an interaction between biotic community (living organisms) and its abiotic environment is called ecosystem.

An ecosystem comprises two main components :
(i) Biotic components including plants, animals and microorganisms : and
(ii) Abiotic components that mainly includes non-living factors like water, minerals, temperature and light.

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