Question

8.
List three human activities responsible for the pollution
Name the various organisms involved in nitrogen cycle.
What does the presence of smog in an area indicate ?
9. Explain the following terms:
(1) Nitrogen fixation, (ii) Nitrification, (iii) Denitrification.
10. - List any three human activities which would lead to an increase in the carbon
dioxide content of air.
11. What are the three subzones in the Biosphere?
12. The process in which water evaporates and falls on the land as rain and later flows
back into the sea via rivers is known
13. What are the four major water Pollutants
14. Write a short notes on Nitrogen fixation by Bacteria
15. What is Greenhouse Effect?
16. What is the percentage of Oxygen gas in our atmosphere
17. Which organisms are found on the bark of trees as indicators of pollution free
environment?
18. Write about the Ozone hole in the Antarctica
19. What are the two ways to fix Carbon dioxide on earth?
20. Mention any two important features of Water.
21. How the Depressions effect our environment?
22. Define the term Soil Pollution. Give one reason for it.
23. How changes of temperature effect living organisms in water?
24. What is Humus?
25. Mention its importance in two points.
26. What is deforestation? Give two reasons for it.
27. Define Global Warming, mention two causes for it.
28. What is Ozone Depletion? Give two reasons for it.
29. Draw the schematic diagram of Water Cycle in the nature​

Answer 1

10 answer

1. increase in use of vehicles
2. deforstation
3. excessive no. of industries

Answer 2

Answer:

Explanation:

Awnser-16:- 21%