Question
Biology Question on plant growth and development
Which one of the following is a long day plant?
A
Bajra
B
Soyabean
C
Tobacco
D
Wheat
Answer
Wheat
Explanation
Solution
Long-day plants usually flower in the spring or early summer; they flower only if the light periods are longer than a critical length, which is usually 9-16 hours. For example, wheat plants flower only when light periods exceed fourteen hours.