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प्रश्न
Answer the following question.
Explain any two ways by which apomictic seed can develop.
उत्तर
The two ways in which apomictic seeds can develop are:-
- Recurrent Apomixis: An embryo sac develops from the megaspore mother cell with disturbed meiosis due to which the egg-cell is diploid. The embryo subsequently develops directly from the diploid egg-cell without fertilization.
- Adventive Polyembryony: Embryos arise from a cell or a group of cells either in the nucellus or in the integuments, e.g. in oranges and roses. Since it takes place outside the embryo sac, it is not grouped with recurrent apomixis. The embryo within the embryo sac may also develop simultaneously, thus giving rise to polyembryony condition, as in Citrus, Opuntia.
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संबंधित प्रश्न
Differentiate between perisperm and pericarp.
State a similarity and a difference observed between Parthenocarpy and apomixis.
Seed formation without fertilization in flowering plants involves the process of ______.
Number of meiotic divisions required to produce 200/400 seeds of pea would be ______.
Parthenocarpic tomato fruits can be produced by ______.
Parthenocarpic fruit formation would not be desirable in the cultivation of:
Seed made its appearance for the first time in ______.
Seeds are regarded as products of sexual reproduction because they ______.
Leaves of dicotyledonous plants possess ______ venation, while ______ venation is the characteristic of most monocotyledons.
Remnants of nucellus are persistent during seed development in ______.
