Question

WHAT IS CLEISTOGAMOUS FLOWERS

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Answer 1

Cleistogamy is a type of automatic self-pollination of certain plants that can propagate by using non-opening, self-pollinating flowers. Especially well known in peanuts, peas, and pansy this behavior is most widespread in the grass family. However, the largest genus of cleistogamous plants is Viola.

The more common opposite of cleistogamy, or "closed marriage", is called chasmogamy, or "open marriage". Virtually all plants that produce cleistogamous flowers also produce chasmogamous ones.[1] The principal advantage of cleistogamy is that it requires fewer plant resources to produce seeds than does chasmogamy, because development of petals, nectar and large amounts of pollen is not required. This efficiency makes cleistogamy particularly useful for seed production on unfavorable sites or adverse conditions. Impatiens capensis, for example, has been observed to produce only cleistogamous flowers after being severely damaged by grazing and to maintain populations on unfavorable sites with only cleistogamous flowers. The obvious disadvantage of cleistogamy is that self-fertilization occurs, which may suppress the creation of genetically superior plants.

Answer 2

Answer:

Cleistogamous flowers  do not open at all. In such flower, anther and stigma lie close to each other. Pollen grains come in contact with stigma resulting in pollination. Thus these are strictly autogamous as there is no chance of cross pollination. Some plants such as Viola, Commelina and Oxalis, have both types of flowers, chasmogamous as well as cleistogamous.

Explanation:

Note: Chasmogamous are open flowers with exposed anthers and stigma.

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