Question

Direction: Below are shuffled events of the Nitrogen Gas Cycle. Arrange them in order starting with the given statement. Use letters to indicate the chronology of events.
Free Nitrogen in the atmosphere.

1. Nitrogen compounds are passed to animals through the food chain
2. Nitrogen dioxide dissolves into water droplets in the cloud to form nitric acid
3. Nitrites are converted into Nitrates with the help of another type of nitrifying bacteria using the process of nitrification.
4. Nitrates are used by plants to build proteins
5. Ammonia in the soil turns into ammonium when it reacts with water.
6. Fuses with oxygen gas due to lightning bolts to form Nitrogen dioxide
7. When an animal dies, nitrogen compounds in its body are converted into ammonium through ammonification with the help of ammonifying bacteria
8. Ammonium, Nitrates, and Nitrites are converted back as free nitrogen by the denitrifying bacteria through the process called denitrification
9. Nitric acid forms into nitrates and goes down to the soil through the precipitation of water
10. Ammonium is converted into Nitrites with the help of nitrifying bacteria using the process of nitrification.

Answer 1

Answer:

Atmospheric nitrogen is unreactive. Hence, it cannot be used directly by the plants.

Certain bacteria, blue green algae, etc, in the soil convert the atmospheric nitrogen into usable compounds.

These compounds are absorbed by the plants to synthesise proteins. Herbivores obtain nitrogen by feeding on these plants, while carnivores obtain nitrogen from feeding either herbivores or other carnivores.

Upon the death of organisms, certain bacteria, fungi, etc in the soil convert the nitrogenous wastes into usable forms. These are absorbed by the plants again.

Also certain other bacteria convert some part into gaseous nitrogen which is again released into the atmosphere.

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