Assertion: Nitrogen- fixing bacteria in legume root nodules survive in oxygen- depleted cells of nodules. Reason: Legheamoglobin completely removes oxygen from the nodule cells.

Question

Assertion: Nitrogen- fixing bacteria in legume root nodules survive in oxygen- depleted cells of nodules. Reason: Legheamoglobin completely removes oxygen from the nodule cells. (A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion (B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion (C) If Assertion is true but Reason is false (D) If both Assertion and Reason are false

Tardigrade Admin · Accepted Answer

Nitrogen-fixing bacteria that is found in legume root cannot survive in cells that have oxygen because in the presence of oxygen the nitrogen formation cannot take place. This is a symbiotic relationship where the root nodules provide nutrition and a place to live the bacteria and the bacteria provides nitrogen to the plant.
For this condition, a molecule known as leg haemoglobin is present which helps in removing the oxygen from the cell so that the bacteria can fix nitrogen.

Q. Assertion : Nitrogen- fixing bacteria in legume root nodules survive in oxygen- depleted cells of nodules. Reason : Legheamoglobin completely removes oxygen from the nodule cells.

If both Assertion and Reason are true and Reason is the correct explanation of Assertion

If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

If Assertion is true but Reason is false

If both Assertion and Reason are false

Q. Assertion : Nitrogen- fixing bacteria in legume root nodules survive in oxygen- depleted cells of nodules.
Reason : Legheamoglobin completely removes oxygen from the nodule cells.