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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
State what is apomixis. Comment on its significance. How can it be commercially used?
Why are some seeds referred to as apomictic seeds?
Define Apomixis.
The ______ collect the pollen grains.
Fill in the blank:
The pollen grains represent the ________.
Once the pollen reaches the stigma, the pollen tube traverses down the ________ to the ovary where fertilization occurs.
What is adventive polyembryony?
The polyembryony commonly occurs in ______.
The occurrence of two or more embryos in one ovule is called ______
Give reason: Nucellar polyembryony is significant in horticulture.
