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प्रश्न
Give an account of polyembryony.
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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.
APPEARS IN
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?
Explain the different ways apomictic seeds can develop, Give an example of each.
Mention one advantage of apomictic seeds to farmers.
Define Apomixis.
Answer the following question.
When a seed of orange is squeezed, many embryos, instead of one are observed. Explain how it is possible.
The ______ collect the pollen grains.
Once the pollen reaches the stigma, the pollen tube traverses down the ________ to the ovary where fertilization occurs.
The occurrence of two or more embryos in one ovule is called ______
Give reason: Nucellar polyembryony is significant in horticulture.
