Question

State two sources through which pant obtain nitrogen

Answer 1

Answer:

• The two main sources by which plants obtain nitrogen are the dissolve nitrogen in the soil, and through atmosphere.

Explanation:

• Nitrogen is one of the most essential mineral nutrient of the plant along with phosphorus and potassium.

• They are important because it forms the basis of amino acids which makes up plant proteins. It is also an important component of chlorophyll which helps in the photosynthesis and hence the nutrition of the plants. It also acts as an energy transfer molecule.

• The atmosphere acts as the reserve of nitrogen gas, because about 78% of the gases in atmosphere is nitrogen.

• The first major source of nitrogen is atmospheric nitrogen which is available to the plants during lightning and thunderstorms, in which the gaseous N2 gas is converted into nitrates and nitrites in the soil, which is then absorbed by the roots of the plants, this is called as atmospheric nitrogen fixation.

• The atmospheric nitrogen is also fixed by the help of bacteria called Rhozobium, which is food in the root nodules of the legumes. This process is called as Biological nitrogen fixation.

• The second method by which plants absorb nitrogen is through dissolved minerals in the soil.

• The organic matter present in the soil acts as nitrogen reserve, through which many plants obtain their nutrition.