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51.

Give a flow chart of sewage treatment.

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52. What is ‘Secondary treatment” of sewage ?

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53. Differentiate primary sludge and activated sludge.

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54. What are methanogens ? Give the examples of Methanogenic bacteria.

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55. Where do you find methanogens ?

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Baculo viruses are those viruses, which attack insects and other arthropods. e.g., Nuclepolyhedrovirus.

Significance

1. Baculo viruses are highly suitable for species-specific and narrow spectrum insecticides.

2. They have no negative impacts on plants, birds, mammals or even other non-target insects.

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57.

Draw a simple diagram to show anaerobic sludge digester.

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58. Give the full form of Bt. Name the insects killed by it.

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59. Name the protein produced by B. thuringiensis.

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60. Name five micro-organisms used as a biofertilizer..

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