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In a flower, if the megaspore mother cell forms megaspores without undergoing meiosis and if one of the megaspores develops into an embryo sac, its nuclei would be:
(A) Haploid
(B) Diploid
(C) A few haploid and a few diploid
(D) With varying ploidy.
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(B) In some species, the diploid egg cell is formed without reduction division and develops into an embryo without fertilization. It is an a sexual reproduction which occurs in the absence of pollinators or in extreme environments. In some species like citrus plants, nucellar cells surrounding the embryo sac start dividing and develop into embryos. It occurs in the megaspore mother cell without undergoing meiosis and produces diploid embryo sac through of desirable characters for indefinite period. Thus, it can be concluded that apomictic species produce diploid cells. Haploid cells will be formed during sexual reproduction when cell will undergo meiosis.
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Practice questions from Oswaal CBSE MCQs Chapterwise For Term I II, Class 12, Biology (Oswaal)
Question 1
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Reason (R) : Cleistogamous flowers have no chance of cross pollination and they are invariably autogamous.
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(B) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(C) Assertion (A) is true but reason (R) is false.
(D) Assertion (A) is false but reason (R) is true.
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Reason (R) : Anatropous ovule is horse-shoe shaped.
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(C) Assertion (A) is true but reason (R) is false.
(D) Assertion (A) is false but reason (R) is true.
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(A) Bagging of female flower
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| Question Text | In a flower, if the megaspore mother cell forms megaspores without undergoing meiosis and if one of the megaspores develops into an embryo sac, its nuclei would be: (A) Haploid (B) Diploid (C) A few haploid and a few diploid (D) With varying ploidy. |
| Updated On | Jun 11, 2023 |
| Topic | Sexual Reproduction in Flowering Plants |
| Subject | Biology |
| Class | Class 12 |
| Answer Type | Text solution:1 Video solution: 2 |
| Upvotes | 274 |
| Avg. Video Duration | 8 min |
