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51.

List any three important characteristics of a population and explain.

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52. Explain competitive release.

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53. List the various attributes of a population.

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54.

Explain J-Shaped pattern of population growth.

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55. Compare J-shaped pattern with S-shaped pattern of population growth.

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56.

Explain population density.

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57. Differentiate natality rate and Mortality rate.

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Differences between Natality Rate and Mortality Rate

Emmigration	Immigration
It is the number of individuals of the same species that leave the habitat and go elsewhere during the time period under consideration.	It is the number of individuals of the same species that move into the habitat during the time period under consideration.
2. It results in decrease in population.	2. It results in increase in population.

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59.

Give an example for:
(a) An endothermic animal
(b) An ectothermic animal
(c) An organism of benthic zone

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60. What is predator and prey ? Give example.

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