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(i) With the help of a neat labelled dia...

(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.

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(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.

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(a) Draw well labelled diagram of oxygen cycle in nature. (b) Explain in how many ways O_(2) is used up from the atmosphere and how it returns back to atmosphere.

Carbon dioxide is an essential component of atmosphere. However, when the concentration of CO_2 increases in the atmosphere, it can lead to global warming through green house effect. Similarly, rain water is an essential source of water. It has pH of 5.6 due to the formation of H^+ ions from the reaction of rain water with CO_2 present in the atmosphere. When pH of the rain water falls below 5.6 due to the presence of acids in the atmosphere, it has very damaging effects. Name two main acids present in acid rain. From where do these acids come in acid rain ?

Carbon dioxide is an essential component of atmosphere. However, when the concentration of CO_2 increases in the atmosphere, it can lead to global warming through green house effect. Similarly, rain water is an essential source of water. It has pH of 5.6 due to the formation of H^+ ions from the reaction of rain water with CO_2 present in the atmosphere. When pH of the rain water falls below 5.6 due to the presence of acids in the atmosphere, it has very damaging effects. Why is acid rain considered as a threat to Taj Mahal in Agra ?