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Pick out the correct option from (a) to (e).
A. Primary succession begins in areas where natural communities have been destroyed.
B. Hydrarch succession takes place in water.
C. The climax community is the community that is in near equilibrium with the immediate environment.
D. In newly cooled lava secondary succession occurs.

A

A and B are correct , C and D are incorrect

B

B and C are correct , A and D are incorrect

C

A and D are correct , B and C are incorrect

D

B only is correct , A , C and D are incorrect

Text Solution

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The correct Answer is:
B
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Explain 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?

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Read the following statements and state how many of them are true ? (P) primary succession , is a very slow process taking thousands of years for the climax to be reached . (Q) All succession whether taking place in water or land proceeds ti a similar climax community, the mesic. (R) As succession proceeds, the number and types of animals and decomposers also change. (S) Saprophytes are not given any place in the ecological pyramids as they play no role in the ecosystem.

Assertion: Primary succession occurs over a primarlly bare area where there was no living matter from the very beginning Reason: During primary succession, reproductive structures of the previous occupants give rise to a new seral community as soon as the conditions become favourable.

(a) Comment on the pattern in which all communities undergo a change in composition and structure with changing environmental conditions. (b) Explain 'Climax community' and 'sere'. Differentiate between primary and secondary succession with examples.

MODERN PUBLICATION-ECOSYSTEM -COMPETITION FILE (OBJECTIVE TYPE QUESTIONS)(A. MULTIPLE CHOICE QUESTIONS)
  1. Select the correct statement :

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  2. The rate of biomass production and the rate of production of organic m...

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  3. Pick out the correct option from (a) to (e). A. Primary succession ...

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  4. Read the statements regarding a stable community and choose the correc...

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  5. which of the following is called is called a link between producers an...

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  6. Which of the following is secondary production in an ecosystem ?

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  7. The pyramid of numbers in a grassland ecosystem is

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  8. Which of the following is a correct food chain?

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  9. The primary producers of the deep-sea hydrothermal vent ecosystem are:

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  10. Which of the following would appear as the pioneer organisms on bare r...

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  11. Which of the following is a characteristic feature of cropland ecosyst...

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  12. The term ecosystem was coined by

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  13. Amount of energy transferred from one trophic level to next is

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  14. Which of the following scientists proposed the concept of ecological f...

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  15. In the process of plant ecological succession, the final stage is :

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  16. A grazing food chain always starts with :

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  17. Source of energy in an ecosystem is :

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  18. Which of the following gas contributes maximum in global warming ?

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  19. Deforestation generally results in reduction of :

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  20. Biomagnifications is due to :

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