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Question
Best example of polyembryony is .................
Best example of polyembryony is .................
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Solution
The correct option is B Citrus
Polyembryony has been defined as the occurrence of more than one embryo in a seed. However, the additional embryos may not always mature. They may become arrested at very early stages and may degenerate during the course of seed development. Except for a few taxa like Citrus and Mangifera, polyembryony occurs only as an abnormal feature. Polyembryony in angiosperms may arise by
(i) Cleavage of proembryo. It is widespread in gymnosperms
(ii) Formation of embryos by cells of the embryo sac other than egg as in Aristolochia, Poa etc.
(iii) Development of more than one embryo sac within the same ovule example Casuarina
(iv) Activation of some sporophytic cells of the ovule as in Citrus.
Polyembryony has been defined as the occurrence of more than one embryo in a seed. However, the additional embryos may not always mature. They may become arrested at very early stages and may degenerate during the course of seed development. Except for a few taxa like Citrus and Mangifera, polyembryony occurs only as an abnormal feature. Polyembryony in angiosperms may arise by
(i) Cleavage of proembryo. It is widespread in gymnosperms
(ii) Formation of embryos by cells of the embryo sac other than egg as in Aristolochia, Poa etc.
(iii) Development of more than one embryo sac within the same ovule example Casuarina
(iv) Activation of some sporophytic cells of the ovule as in Citrus.
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