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Predators are of great importance as they play the following important roles in an ecosystem :

1. They act as ‘conduits’ for energy transfer to higher trophic levels.

2. They keep the prey population under control, which otherwise can reach very high population density and cause imbalance in the ecosystem.

3. They help in maintaining species diversity in a community by reducing the intensity of competition among the competing prey species.

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62. Define population and community

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63. Name the two processes which result in increase in population.

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64. Name the major abiotic factors and state their importance.

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65.

With the help of suitable diagram describe the logistic population growth curve.

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66. Write short notes on :

(a) adaptations of desert plants and animals.

(b) adaptations of plants to water scarcity.

(d) importance of light to plants.

(e) Effect of temperature or water scarcity and the adaptations of animals.

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67.

Define the following terms and give one example for each:
(a) Commensalism
(b) Parasitism
(c) Camouflage
(d) Mutualism
(e) Interspecific competition

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68. Make a table showing behavioural strategies of adaptations in animals.

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69. Discuss various adaptation found in animals in winter of polar regions.

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70. How do desert plants prevent loss of water ?

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