Question

Pea flowers produce assured seed sets. Give a reason.

Answer 1

1. Because pea blossoms are cleistogamous, that is, they do not open, they yield guaranteed seed sets. 
2. Because the stigma and anther are near one another inside the closed flower, this guarantees self-pollination. 
3. Even without pollinators, pollination is facilitated when the anthers dehisce, and the pollen grains come into contact with the stigma, ensuring seed formation.