Question

Study the cycle shown above and select the option which gives correct words for all the four blanks A, B, C and D.

| A| B| C| D
---|---|---|---|---
1| Denitrification | Nitrification| Plants| Animals
2| Nitrification | Ammonification | Animals | Plants
3| Denitrification | Ammonification| Plants| Animals
4| Nitrification| Denitrification| Animals| Plants

A. 1
B. 2
C. 3
D. 4

Answer 1

All life on the planet depends on nitrogen. Nitrogen, a compound component, is utilized by organisms, plants and creatures to live. Nonetheless, nitrogen is reused in a cycle called the nitrogen cycle. This cycle has numerous means, however maybe the main advance is denitrification. Denitrification is the last advance in the nitrogen cycle where the decrease of soil nitrate to nitrogen-containing gases, for example, nitric oxide, nitrous oxide, and nitrogen gas, happens.

Complete answer:
Denitrification depends on microbial movement to break separated nitrogen-containing components. Microorganisms burn-through nitrate to deliver energy, however simultaneously, denitrification happens and nitrogen is decreased. In particular, soil organisms use nitrate as the terminal electron acceptor to shape nitrite in a cycle called decrease. Nitrite is additionally diminished to nitric oxide then to nitrous oxide and afterward nitrogen gas.
This cycle is quickened by denitrifying microbes like pseudomonas. Ammonification is performed by microbes to change the smelling salts over to ammonium.

Nitrification would then be able to happen to change the ammonium over to nitrite and nitrate. Microorganisms that can fix nitrogen are prokaryotes (the two microscopic organisms and archaea, conveyed all through their individual realms) called diazotrophs.
Some higher plants, and a few creatures (termites), have shaped affiliations (advantageous interaction) with diazotrophs. In spite of the fact that nitrogen is extremely plentiful in the environment as dinitrogen gas ($N_2$), it is generally distant in this structure to most life forms, making nitrogen a scant asset and frequently restricting essential profitability in numerous biological systems. Just when nitrogen is changed over from nitrogen gas into alkali ($N{H_3}$) does it become accessible to essential makers, for example, plants.

Hence, the correct answer is option (C).

Note: Nitrogen is one of the essential supplements basic for the endurance of every living being. Despite the fact that nitrogen is extremely plentiful in the environment, it is generally distant in this structure to most living beings. This article investigates how nitrogen opens up to living beings and what changes in nitrogen levels because human movement is intended to nearby and worldwide biological systems.