Question

With respect to photoperiodism, these are long day plants

• A. Wheat, oat, soyabean
• B. Wheat, xanthium, paddy
• C. Wheat, poppy, soyabean
• D. Wheat, poppy, beet

Answer 1

The correct option is D Wheat, poppy, beet

Long day plant will be induced to flower only when the period of available light exceeds a given critical or limiting period. Examples are wheat, poppy, oat, beet, etc. Phytochromes are the pigments which absorb light required for these processes.