Question

140
• Answer the following questions as directed :
17. Which is the largest and important part of human brain?
18. What are acquired characteristics (traits)?
19. For what purpose is the study of fossils important?
20. Write Ohm's law.
21. Give names of two metals useful to make solar cell panel.
22. What is ozone hole ?
23. Why was the Ganga Action Plan launched ?
24. Match the given pair properly:
Group B (Location)
Group A (Gland)
a. Adrenal
1. In throat​

Answer 1

Answer:

22.When the sun's warmth returns in Spring, its energy 'activates' these halogen atoms, which then voraciously react with the ozone, destroying it, and opening the so-called hole. In fact, the 'hole' is a thinning of the ozone layer, rather than its complete destruction.

23.Ganga Action Plan was launched by Rajiv Gandhi in India on January 14, 1986. The main aim of this plan was to protect the river Ganga from further more pollution. It was launched to improve the quality of water treatment of the sewage, interception and other methods, also to prevent the mixing of the industrial wastes.

Explanation:

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