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प्रश्न
Give an account of polyembryony.
संक्षेप में उत्तर
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उत्तर
Polyembryony:
- Polyembryony is the occurrence of more than one embryo in a seed which consequently results in the emergence of multiple seedlings.
- The additional embryos result from the differentiation and development of various maternal and zygotic tissues associated with the ovule of the seed.
- In adventive polyembryony, an embryo develops directly from the diploid cell of nucellus and integuments as in Citrus.
- In cleavage polyembryony, zygote proembryo sometimes divides (cleaves) into many parts or units. Each unit then develops into an embryo.
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संबंधित प्रश्न
Explain the different ways apomictic seeds can develop, Give an example of each.
State what is apomixis. Write its significance. How can it be commercially used?
How polyembryony can be commercially exploited?
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 | ||
The polyembryony commonly occurs in ______.
Give reason: Nucellar polyembryony is significant in horticulture.
Which type of polyembryony involves diploid cells of the nucellus or integuments developing directly into embryos?
Which plants exhibit adventive (nucellar) polyembryony?
What is the source of polyembryos in Balanophora?
Which theory explains polyembryony through the release of chemical stimuli from degenerating cells?
