Question

The product(s) of reaction catalyzed by nitrogenase
in root nodules of leguminous plante islare:
(1)
Nitrate alone
(2)
Ammonia and oxygen
(3)
Ammonia and hydrogen
Ammonia alone​

Answer 1

The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plante are Ammonia and hydrogen .

Answer:

Option 3 is right .

Explanation:

BIOLOGICAL NITROGEN FIXATION:

• The fixation of atmospheric nitrogen into ammonia in the root of plants by biological organisms is called biological nitrogen fixation.

• The organisms involved in the nitrogen fixation may be free living or symbiotic.

SYMBIOTIC NITROGEN FIXATION:

• The roots of leguminous plants are in close association with rhizobium bacteria.

• Rhizobium bacterias infect the root and leguminous plants and cause the root nodules.

• These root nodules have an enzyme calles nitrogenase.

• Nitrogenase enzyme converts nitrogen into ammonia.

• Nitrogenase is an oxygen sensitive enzyme and therefore it is associated with leg haemoglobin which is an oxygen scavenger.

• Niteogen fixation is highly an energy consuming process. 8 ATP molecules are needed for producing one mole of ammonia.

• The products of the reaction are two moles of ammonia, one mole of hydrogen, 16 ADP and 16 inorganic phosphate.

REACTION:

N2+ 8H+ + 16 ATP -----> 2NH3 + H2 + 16 ADP + 16 Pi