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Organisms and Populations

Short Answer Type

31. What is brood parasitism ? Give an example.

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32. List a few adaptations which parasites have developed.

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Long Answer Type

33. Define mutualism. Give examples.

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Short Answer Type

34. Describe the phenomenon of parasitism.

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35. Describe the phenomenon of commensalism with an example of commensal between an orchid growing as an epiphyte on a mango branch.

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36. Describe the phenomenon of mutualism with the example of lichen.

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37. What is immigration and emigration ?

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38. Explain Gause’s competitive exclusion principle.

Gause observed that out of two species of Paramecium grown together, one is eliminated. This phenomenon is called Gause’s hypothesis or Gause’s principle of exclusion.

It states that two closely related species competing for the same resource cannot co-exist indefiinitely, and it eventually leads to the elimination of the inferior species.

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39. How is diapause different from hibernation ?

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40. What do you understand by resource partitioning.

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