Question

1. What is atmospheric fixation of Nitrogen?
2. Make neat and labelled sketch of Nitrogen cycle in nature.
3. Describe in brief the role of Nitrogen fixing bacteria and of
lightening in fixing atmospheric nitrogen.
4. Draw flow diagram of oxygen cycle
5. Draw a labelled diagram to show carbon cycle in nature.
6. What are the causes of increase in the concentration of carbon
dioxide in the atmosphere?
7. How is carbon dioxide converted into organic compounds?

Answer 1

Answer:

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$<p style="color:cyan;font-family:cursive;background:black;font size 25px;"> Nitrogen fixation is a process by which molecular nitrogen in the air is converted into ammonia (NH. 3) or related nitrogenous compounds in soil. Atmospheric nitrogen is molecular dinitrogen, a relatively nonreactive molecule that is metabolically useless to all but a few microorganisms.$.

6.)Carbon dioxide is added to the atmosphere naturally when organisms respire or decompose (decay), carbonate rocks are weathered, forest fires occur, and volcanoes erupt. Carbon dioxide is also added to the atmosphere through human activities, such as the burning of fossil fuels and forests and the production of cement.

7.)Photosynthesis in plants makes useful organic compounds out of carbon dioxide through carbon-fixation reactions. ... The process of photosynthesis in plants involves a series of steps and reactions that use solar energy, water, and carbon dioxide to produce oxygen and organic compounds.

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Answer 2

Answer:

The carbon cycle describes the process in which carbon atoms continually travel from the atmosphere to the Earth and then back into the atmosphere. Since our planet and its atmosphere form a closed environment, the amount of carbon in this system does not change. Where the carbon is located — in the atmosphere or on Earth — is constantly in flux.

On Earth, most carbon is stored in rocks and sediments, while the rest is located in the ocean, atmosphere, and in living organisms. These are the reservoirs, or sinks, through which carbon cycles.

Carbon is released back into the atmosphere when organisms die, volcanoes erupt, fires blaze, fossil fuels are burned, and through a variety of other mechanisms.

In the case of the ocean, carbon is continually exchanged between the ocean’s surface waters and the atmosphere, or is stored for long periods of time in the ocean depths.

Humans play a major role in the carbon cycle through activities such as the burning of fossil fuels or land development. As a result, the amount of carbon dioxide in the atmosphere is rapidly rising; it is already considerably greater than at any time in the last 800,000 years.