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Farmers do not apply nitrogenous fertilizers in the cultivation of pulses plant. Why?
(a) Pulses plant already have stored much nitrogenous compound.
(b) Pulses plant do not need the compound of nitrogen because they are autotrophs.
(c) Pulses plant fulfill their needs by saprotrophic nutrition.
(d) Pulses plant derive nutrition from the symbiotic association.
Correct Answer: (d) Pulses plants derive nutrition from the symbiotic association.
Explanation:
Rhizobium is a soil bacterium that can fix atmospheric nitrogen within the root nodules of leguminous plants. Rhizobium lives in a symbiotic association with leguminous plants. The bacteria cannot fix nitrogen alone.
The plants act as a host and provide sugar to the rhizobium. The rhizobium enters into the plant roots through root hair which causes infection in roots and the formation of root nodules.
The rhizobium takes the atmospheric nitrogen and turns it into ammonia (NH3), which acts as a natural fertilizer for plants.
Updated on: 12-Jan-2023
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