Sexual Reproduction in Flowering Plants
Outbreeding devices
- Dioecious plant in which the male and female organs appear on separate individuals, that is noted as unisexuality (or) Dicliny
Eg : Vallisneria, Morus alba, Piper Bechtel. - If the pollen grain of a flower has no fertilizing effect on the stigma of the same flower, it is termed as self-incompatibility (or) self-sterility.
Eg: Thea sinensis, Passiflora. - Dichogamy is of 2 types
(i) Protandry, where anther matures earlier than gynoecium
Eg: Cotton, lady’s finger, Helianthus annus
(ii) Protogyny – Gynoecium matures earlier than the androecium
Eg: Mirabilis, Brassica, Ficus etc. - The foreign pollen grain germinating vigorously than the same flower’s pollen grain is termed as prepotency
Eg: Fabaceae. - The presence of natural and physical barrier between androecium and gynoecium to avoid self-pollination is called Herkogamy
Eg: Calotropis - In certain plants, flowers possess anthers and stigma at different positions of height called Heterostyly.
Watch this video for the topic from 0:08 to 12:09
Disclaimer: Compete.etutor.co may from time to time provide links to third party Internet sites under their respective fair use policy and it may from time to time provide materials from such third parties on this website. These third party sites and any third party materials are provided for viewers convenience and for non-commercial educational purpose only. Compete does not operate or control in any respect any information, products or services available on these third party sites. Compete.etutor.co makes no representations whatsoever concerning the content of these sites and the fact that compete.etutor.co has provided a link to such sites is NOT an endorsement, authorization, sponsorship, or affiliation by compete.etutor.co with respect to such sites, its services, the products displayed, its owners, or its providers.