Explain any two devices by which autogamy is prevented in flowering pl

1.	Explain any two devices by which autogamy is prevented in flowering plants.
Answer» (i) Male and female flowers are present on different plants. (ii) The stamens and stigma of a bisexual flower mature at different times. (a) Anthers mature earlier than the stigma and release pollens. (b) The stigma matures earlier than the anther. (iii) Flowers are self-sterile or self-incompatible. (iv) Chasmogamous flowers are present with exposed stamens and stigma which facilitate cross-pollination.

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

Answer»

(i) Male and female flowers are present on different plants.

(ii) The stamens and stigma of a bisexual flower mature at different times.

(a) Anthers mature earlier than the stigma and release pollens.

(b) The stigma matures earlier than the anther.

(iii) Flowers are self-sterile or self-incompatible.

(iv) Chasmogamous flowers are present with exposed stamens and stigma which facilitate cross-pollination.