Pre-fertilisation : Structures and Events
Question
Ploidy of synergid is
Easy
Solution
Synergids are haploid because haploid megaspore divides mitotically to produce them.
Megaspore mother cell (2n) undergoes meiosis to give rise to 4 haploid (n) megaspores. Out of four megaspores three degenerstes and one remains functional. Functional megaspore undergoes three times free nuclear mitosis to form 8 nucleated and 7 celled embryosac with wall formation after nuclear divisions.
2 synergids (n) + 1 central cell (n + n) + 1 egg cell (n) + 3 antipodals (n) = 7 celled and 8 nucleated embryosac
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