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81.

Why does ozone hole form over Antarctica? How will enhanced ultraviolet radiations affect us?

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82.

Write the name of the organism that is referred to as the 'Terror of Bengal'.

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Causes of accelerated eutrophication:

i) Industrial wastes which are a great source of nitrogen and phosphorous that over-stimulate the algal growth.

ii) Sewage and agricultural wastes also lead to increase in temperature and BOD of the water body thereby leading to algal blooms.

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84. Determination of Biological Oxygen Demand (BOD) can help in suggesting the quality of a water body. Explain.

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85.

Since October 02, 2014 'Swachh Bharat Abhiyan' has been launched in our country.

(a) Write your views on this initiative giving justification.

(b) As a biologist name two problems that you may face while implementing the programme in your locality.

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86.

Name any two sources of e-Wastes and write two different ways for their disposal.

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87.

How have human activities caused desertification? Explain.

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88.

How does algal bloom destroy the quality of a fresh water body? Explain.

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89.

Why is Eichhornia crassipes nicknamed as Terror of Bengal?

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90.

By the end of 2002 the public transport of Delhi switched over to a new fuel. Name the fuel. Why is this fuel considered better? Explain.

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