BOD (Biological oxygen demand) measures the milligrams of oxygen consumed during the biological decomposition of organic matter occurring in a litre of waste water during a specified period of time.
COD (Chemical oxygen demand) determines the milligrams of oxygen per litre of waste water which are consumed during the oxidation of the organic matter to give carbon dioxide, ammonia, and water.
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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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68.
Why are biofertilizers or biopesticides preferred to chemical fertilizers or pesticides ?
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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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