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Ovaries

Mention the r...

Question

Mention the reasons for the difference in ploidy of zygote and primary endosperm nucleus in an angiosperm?

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Solution

The zygote is formed by the fusion of male gamete(n) and female gamete (n) called syngamy, so it is diploid in nature, and primary endosperm nucleus is formed by the fusion of secondary diploid nucleus (2n) with one of the male gamete(n), so it is triploid in nature.

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Q. The ploidy level of primary endosperm nucleus in Oenothera before

fertilization is ................

Mention the ploidy of the following:

(a) protonemal cell of a moss

(b) primary endosperm nucleus in dicot

(c) leaf cell of a moss; prothallus cell of a fern

(d) gemma cell in Marchantia

(e) meristem cell of monocot

(f) ovum of a liverwort

(g) zygote of a fern.

Q. Mention the ploidy of the following:

Primary endosperm nucleus in dicot.

Q. Mention the ploidy of the following:

1. Protonemal cell of a moss,

2. Primary endosperm nucleus in dicot,

3. Leaf cell of a moss,

4. Prothallus cell of a fern,

5. Gemma cell in Marchantia,

6. Meristem cell of a monocot,

7. Ovum of a liverwort,

8. Zygote of a fern.

Q. In angiosperms, the zygote is diploid while the primary endosperm cell is triploid. Explain.

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