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61. Define BOD and COD.

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62. Do you think microbes can be used as source of energy ? If yes, how ?

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63. Microbes can be used to lessen the burden of use of chemical pesticides. Explain how this can be accomplished.

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64. Write a short note on natural insecticides.

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65. What is biopesticide ? Give a few examples.

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66. What for Nucleopolyhydro viruses are being used now a days?

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67. What are biofertilizers ? Name two organims which fix nitrogen asymbiotically and two organisms with fix symbiotically.

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Biofertilizers or biopesticides are preferred to chemical fertilizers or pesticides because

(i) They are safe to use and are biological in origin.

(ii) They do not spoil the quality of the soil and are target specific instead increases its fertility.

(iii) They do not pollute the atmosphere and are non-poisonous.

(iv) They are less expensive and are biodegradable.

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69. What is biogas ?

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70.

Why is the biogas plant usually built in the rural area?

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