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(i) Make a neat and labelled sketch of n...

(i) Make a neat and labelled sketch of nitrogen cycle in nature.
(ii) Describe in brief the role of nitrogen fixing bacteria and of lightenng in fixing atmospheric nitrogen.
OR
(i) Draw a neat labelled sketch of carbon cycle in nature.
(ii) What is green house effect? How does carbon dioxide cause global warming in the atmosphere.

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(a) Draw a well labelled nitrogen cycle in nature. (b) Describe one biological and one physical method of conversion of nitrogen to forms like nitrates and nitrities. OR (a) Draw a labelled carbon cycle in nature. (b) Describe briefly two process by which carbon dioxide is returned back to the atmosphere.

(a) With the help of well labeled diagram explain water cycle in nature. (b) How is green house effect related to Global warming? Explain.

With the help of a labelled diagram show (a) Nitrogen cycle in nature (b) Describe briefly any two processes involved in the cycling of N_(2) in the environment. OR With the help of a labelled diagram show the cycling of carbon in nature. What are the two ways in which carbon dioxide is fixed in the environment.

Draw diagram of (i) nitrogen cycle, (ii) carbon cycle.

(i) With the help of a neat labelled diagram depcit the cycling of carbon in nature. (ii) Mention two ways in which carbon dioxide is fixed in the environment. OR (i) Describe green house effect. How the presence of green house gases would lead to global warming. (ii) Draw a neat labelled diagram of water cycle in nature.

Study the following statements and select the correct ones . (i) Methanogens are archaebacteria which fixes atmsopheric nitrogen (ii) Nostic is a filamentous blue green alga which fixes atmospheric nitrogen. (iii) Mycoplasma lack cell wall and can surive without oxygen.

Global carbon is fixed in the biosphere through photosynthesis. (a) Explain any two ways by which carbon is returned to the atmosphere through natural processes, (b) List any two human activities that have influenced the carbon cycle in nature.