Question

Can plants prevent self pollination?
A. Stamen and pistil mature at different times.
B. Plants should develop bisexual flowers.
C. Pistil should have increased receptivity for pollen from the same plant.
D. All of the above.

Answer 1

Hint: Pollination is just as important to the overall health of an ecosystem as keystone species are to the structure of a specific habitat. Plants pollinated by a variety of pollinators are healthier, yield more, and produce larger and more nutritious fruits. In bisexual flowers, where stamens and carpels mature at the same time, this is far more certain. Parental traits are preserved indefinitely.
Pollen grains are not wasted.

Complete answer:
Plants avoid self-pollination by employing the following strategies:
i) Incompatibility, which involves stamen and pistil maturing at opposite periods.
ii) By developing blooms that are unisexual.
iii) Pollen release and stigma receptivity do not occur at the same time.
'Stamen and pistil mature at separate times' is the correct answer.
Anthers and stigma are separated in some flowers, preventing pollen grains from the same bloom from reaching the stigma. Pollen and stigma self-incompatibility can be detected in some flowers. Autogamy in these flowers is prevented by a genetically regulated process.

Plants use a variety of methods to avoid self-pollination; many flowers generate both pollen and nectar because insect-pollinated blooms must attract insects to visit the blossoms in order for the pollen to be carried elsewhere.

In flowering plants, self-incompatibility is a common mechanism that prevents inbreeding and encourages outcrossing. One or more multi-allelic loci drives the self-incompatibility response, which is based on a sequence of complicated cellular interactions between self-incompatible pollen and pistil.

Note:-
In the following ways, a chasmogamous bisexual bloom avoids self-pollination: Dichogamy: In this method, pollen release and stigma receptivity are not coordinated. The pollen of one bloom cannot come into contact with the stigma of another flower in this way. Hibiscus gloriosa, for example.