Question

Assertion (A): An embryo sac has three cells called egg apparatus towards the micropylar end, three cells called antipodals on the chalazal end and a large central cell with two nuclei.

Reason (R): 2-Nucleate embryo sac undergoes two sequential mitotic divisions and results in the formation of 4-nucleate and later the 8-nucleate stage of embryo sac.

Options

• Both assertion (A) and reason (R) are true, and reason (R) is the correct explanation of assertion.

• Both assertion (A) and reason (R) are true, but reason (R) is not the correct explanation of assertion.

• Assertion (A) is true but reason (R) is false.

• Both assertion (A) and reason (R) are false.

Answer 1

Both assertion (A) and reason (R) are true, and reason (R) is the correct explanation of assertion.

Explanation:

Both statements are true. Three successive mitotic divisions of the functional megaspore produce eight nuclei, which become organised into the egg apparatus, antipodals and central cell.