Question

Chrysanthemums flower in winter because

• A. They are short day plants
• B. They required low temperature treatment
• C. They are long day plants
• D. Both A and B

Answer 1

Answer: (D)

Both A and B

Short day plants require long period of darkness, short period of light and low temperature to flower. Long day plants will flower when they are exposed to short period of darkness, long period of light and high temperature. Long day plants flower in summer and short day plants flower in autumn and winter. Day neutral plants do not depend upon the amount of darkness or daylight hours. Examples of day neutral plants are sunflower and tomato. Examples of short day plants are chrysanthemums, Christmas cactus, rice, tobacco, cotton. Examples of long day plants are lettuce, spinach, potato.

Thus, the correct answer is option D.