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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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Differences between Natality Rate and Mortality Rate

Natality	Mortality
1.Natality is number of births per unit population per unit time.	1.It is number of deaths per unit population per unit time.
2. It results in the increase in population.	2. It results in the decrease in population.

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58. Differentiate natality rate and death rate.

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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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