NTOOSEN
arbon reservoirs.
come examples?
on
4. Nitrogen gas is more abundant in our atmosphere than
oxygen! However, nitrogen needs to be converted into
different forms to be used by many organisms. Bacteria are
highly involved in this! Describe the role of (A) bacteria
fixing nitrogen as they live symbiotically with some plant
species, (B) nitrifying bacteria, and (C) denitrifying bacteria
in the nitrogen cycle.
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Carbon
Reservoir
rea

A) The role of bacteria fixing nitrogen is very important because it fixes atmospheric nitrogen in the roots of plants. For example, Azotobacter is a bacteria which lives in the root of the higher plants. The bacteria fixes nitrogen for the plant and the plant gives habitat and food to the bacteria and hence, both get benefit.

B) Nitrifying bacteria are the bacteria which converts ammonia into nitrates. Examples are Nitrosomonas and Nitrobacter.

C) Denitrifying bacteria is a type of bacteria which converts nitrates into atmospheric nitrogen. Examples are Serratia and Pseudomonas.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.