Question

some of the angiosperm flowers show self pollination .why?​

Answer 1

Answer:

Angiospermic flowers exhibit various types of contrivances for pollination. Both self and cross pollination are preferred modes of pollination.

1. Monoecious: Flowers are unisexual that is, contain androecium or gynoecium but are borne on the same plant.

Example, members of Cucurbitaceae family

2. Cleistogamous: Flowers are bisexual, prevent cross pollination by remaining closed. These flowers may be borne underground as in Commelina benghalensis

3. Self-incompatibility: Occurs in bisexual flowers, wherein when the pollen grain is deposited on the stigma of a flower having the same genotype. The process of seed formation is prevented at various stages like, the germination of the pollen grain, movement of pollen tube through the style, fusion of gametes etc

Example, certain species of Brassica, Asclepias, Spathodia etc

Explanation:

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