| Read the assertion and reason carefully: |
| Assertion : The embryo sac is 7? celled, 7 ? nucleated structure. |
| Reason : All cells are haploid. |
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: D
Solution :
The female gametophyte, also called embryo sac is mostly a 7-called structure. There is a large central cell with two polar nuclei which later fuse to form secondary nucleus. The micropylar end of central cell is occupied by the egg apparatus, comprising an egg cell and two synergids, and at its chalazal end three antipodal cells are present. Cell of the egg apparatus and the antipodal cells are uninucleate and haploid where as the central cell is binucleate or diploid. Thus embryo sac is 7 - celled, 8 ? nucleated structure.
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