Question

Which of the following non-metal can be used as plant fertilizer and for plant fixation?
A) Nitrogen
B) Carbon
C) Sulphur
D) Iodine

Answer 1

Hint: Out of all the given options, we need to check for that non – metal that is absorbed by the roots but is not present in the soil in absorbable forms in sufficient amounts.

Complete step by step answer:
Nitrogen is an important element for plants. It is a core component of many plant structures and is required for their metabolic processes. Plants are required to manufacture many complex molecules through metabolic activities to survive. They do so by using minerals from the soil that contain nitrogen such as nitrate ions. The health of the parts of the plant (leaves, roots, trunks, etc.) depends on the availability of essential nutrients like nitrogen to enhance the plant's biological processes including growth, absorption, transportation, and excretion.
Nitrogen is a non-metal which is required by the plant in large amounts.
It is not available in soil in absorbable forms in the soil. Plants absorb nitrogen in the form of nitrates. Sometimes, soil is deficient in nitrates. This may be due to various physical conditions.
So, it has to be supplied from outside in order to fulfill the requirements of plants.
For this reason, Nitrogen fertilizers are used in agriculture to provide plants with nitrogen in absorbable forms.

Hence option A is correct.

Note:
-The biomolecules which require nitrogen are –
Proteins
Nucleic acids (DNA and RNA)
- Lack of proper amounts of nutrients leads to deficiency diseases in plants, the names of these diseases can be noted.