Question

Explain any two devices by which autogamy is prevented in flowering plants.


Class 12th ​

Answer 1

The devices that prevent autogamy (self-pollination ) in flowering plants are : ➡Dichogamy : Maturation of male and female reproductive organs at different times by which autogamy is prevented...

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Answer 2

Unisexuality:

In this case, the plant bears either male or female flowers and is not hermaphrodite. It is also called as Dioecism.

Dichogamy:

In this mechanism, the stigma and anther mature at different times. Depending on who matures first, dichogamy can be further divided into two:

1. Protandry: In this type, the androecium matures earlier than the gynoecium. Ex: maize plant
2. Protogyny: In this type, the gynoecium matures earlier than the androecium.

Herkogamy:

This is a name given to a condition where there is a natural physical barrier that prevents the pollen of the same flower from entering the ovary.

Self- Sterility:

In this condition, there is a gene that recognizes the similar gene and does not allow the pollen grain to germinate. This is due to the self-sterile gene present in the ovule and the grain.

u can right any 2 of them... !!kudos:)