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प्रश्न
Explain following term:
Polyembryony
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उत्तर
It is the development of more than one embryo inside the seed, which consequently results in the emergence of multiple seedlings. Polyembryony may be true or false depending upon whether many embryos arise in the same embryo sac in the same ovule.
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संबंधित प्रश्न
Explain any three advantages that seeds offer to angiosperms.
Explain the different ways apomictic seeds can develop, Give an example of each.
How polyembryony can be commercially exploited?
Fill in the blank:
The ________contains the egg or ovum.
Once the pollen reaches the stigma, the pollen tube traverses down the ________ to the ovary where fertilization occurs.
Fill in the blanks:
The ______ are coloured to attract the insects that carry the pollen. Some flowers also produce ______ or ______ that attracts insects.
Match the column.
| Column - I (Structure before seed formation) |
Column - II (Structure after seed formation) |
||
| A. | Funiculus | I. | Hilum |
| B. | Scar of ovule | II. | Tegmen |
| C. | Zygote | III. | Testa |
| D. | Inner integument | IV. | Stalk of seed |
| V. | Embryo | ||
Which of the following is TRUE with respect to cleavage polyembryony?
In case of polyembryony, if an embryo develops from the synergid and another from the nucellus which is haploid and which is diploid?
What is pollen grain?
