Previous Year Question
Plant development is affected by which of the following?
A.
Quality, quantity and duration of light
B.
Only the quality of light
C.
Quality and quantity of light
D.
Quality and duration of light
Correct Answer: A
Detailed Solution
Light is an important external factor affecting plant growth and development. Its effect depends upon the quality, intensity and duration of exposure to light.
According to NCERT, while discussing light as a factor affecting photosynthesis, it is necessary to distinguish between light quality, light intensity and duration of exposure to light. Light intensity affects the rate of photosynthesis, while different wavelengths or qualities of light also influence photosynthesis differently.
NCERT further explains that external factors such as light influence plant growth and development and may affect processes such as flowering, dormancy and seed germination.