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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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Methanogens are found in

(i) the anaerobic sludge (ii) rumen of cattle

(iii) marshy places (iv) flooded rice fields.

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56. What are Baculo viruses ? Write significance.

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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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