(C) The assertion is correct because,during the process of root nodule formation in legumes,the bacteria (e.g.,$Rhizobium$) specifically infect and en

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Assertion is correct,but Reason is incorrect.

(C) The assertion is correct because,during the process of root nodule formation in legumes,the bacteria (e.g.,$Rhizobium$) specifically infect and enter the polyploid cells of the root cortex.However,the reason is incorrect because it is the bacteria that produce cytokinins,which in turn induce polyploidy in the host plant cells,rather than the host cells providing cytokinins to the bacteria to promote bacterial cell division.

Class 11 Biology Mineral Nutrition Symbiotic biological nitrogen fixation

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$A$: Bacteria enter only the polyploid cells of the root cortex.
$R$: These cells provide cytokinins to bacteria,which promote bacterial cell division.

A
Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
B
Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.
C
Assertion is correct,but Reason is incorrect.
D
Both Assertion and Reason are incorrect.

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Mineral Nutrition

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Symbiotic biological nitrogen fixation

Select the correct statements from the given:
$(a)$ Nitrogenase is a heterodimeric protein.
$(b)$ Root hairs curl by action of nitrogenase and plant 'nod factors'.
$(c)$ During symbiotic $N_2$ fixation,$ATP$ is provided by the legume plant.

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We find that $Rhizobium$ forms nodules on the roots of leguminous plants. Also,$Frankia$,another microbe,forms nitrogen-fixing nodules on the roots of the non-leguminous plant $Alnus$. Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition? Explain with the help of one example.

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Symbiotic nitrogen fixation in non-leguminous plants is carried out by

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Which of the following plants does not have $Rhizobium$-containing root nodules?

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What are the conditions necessary for fixation of atmospheric nitrogen by $Rhizobium$? What is their role in $N_2$-fixation?

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$A$: Bacteria enter only the polyploid cells of the root cortex.$R$: These cells provide cytokinins to bacteria,which promote bacterial cell division.

Similar Questions

Select the correct statements from the given:$(a)$ Nitrogenase is a heterodimeric protein.$(b)$ Root hairs curl by action of nitrogenase and plant 'nod factors'.$(c)$ During symbiotic $N_2$ fixation,$ATP$ is provided by the legume plant.

Symbiotic nitrogen fixation in non-leguminous plants is carried out by

Which of the following plants does not have $Rhizobium$-containing root nodules?

What are the conditions necessary for fixation of atmospheric nitrogen by $Rhizobium$? What is their role in $N_2$-fixation?

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$A$: Bacteria enter only the polyploid cells of the root cortex.
$R$: These cells provide cytokinins to bacteria,which promote bacterial cell division.

Select the correct statements from the given:
$(a)$ Nitrogenase is a heterodimeric protein.
$(b)$ Root hairs curl by action of nitrogenase and plant 'nod factors'.
$(c)$ During symbiotic $N_2$ fixation,$ATP$ is provided by the legume plant.