Question

Photoperiodism was first studied by Garner and Allard.

• A. True
• B. False

Answer 1

The correct option is A True

W. W. Garner and H. A. Allard published in 1920 the role of photoperiodism in plants, and put forward that the length of day is the critical factor for flowering of plants, leading to plants being classified as short day or long day plants. It was later discovered that it is in fact the length of the night that is critical, but the classification of Garner and Allard remains in use.