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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.
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संबंधित प्रश्न
Mention one advantage of apomictic seeds to farmers.
The ______ collect the pollen grains.
Fill in the blanks:
The male whorl, called the ________ produces ________.
Fill in the blank:
The ________contains the egg or ovum.
Fill in the blank:
________takes place when one male gamete and the egg fuse together. The fertilized egg grows into a seed from which the new plants can grow.
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.
Fill in the blank:
The whorl ________is green that protects the flower until it opens.
The polyembryony commonly occurs in ______.
In case of polyembryony, if an embryo develops from the synergid and another from the nucellus which is haploid and which is diploid?
