Question

Which of the following is an example of a protandrous flower?

Options

• Gloriosa

• Sunflower (disc florets)

• Aristolochia

• Magnolia

Answer 1

Sunflower disc florets exhibit protandry, where the anthers mature and release pollen before the stigma becomes receptive. Other protandrous examples include Salvia, Calotropis, and Gossypium, all of which prevent self-pollination through this temporal mechanism.