Question

Nitrogen present in the atmosphere is huge amont,but higher plants failed to utilize it .Why?

Answer 1

Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as NO2-, in a process known as fixation. The majority of nitrogen is fixed by bacteria, most of which are symbiotic with plants. Recently fixed ammonia is then converted to biologically useful forms by specialized bacteria.

Answer 2

Nitrogen present in the atmosphere is huge amount,but higher plants failed to utilize it .

Explanation:

• Plants do not use nitrogen directly from the air. This is because nitrogen itself is non reactive, and cannot be used by green plants to make protein.
• Nitrogen gas therefore, needs to be converted into nitrate compound in the soil by nitrogen-fixing bacteria in soil, root nodules or lightning.
• Plants take nitrogen from the soil by absorption through their roots as amino acids, nitrate ions, nitrite ions, or ammonium ions. Plants do not get their nitrogen directly from the air.
• By far the most important nitrogen-fixing symbiotic associations are the relationships between legumes (plants in the family Fabaceae) and Rhizobium and Bradyrhizobium bacteria.
• These plants are commonly used in agricultural systems such as alfalfa, beans, clover, cow peas, lupines, peanut, soybean, and vetches.

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