Which of the Following Signals Indicates Shade to a Plant

Question

Which of the following signals indicates shade to a plant?
A) far- red light
B) blue light
C) lower temperature
D) green light

Accepted Answer

Far-red light is a signal for shade to the plant. When a plant is shaded by another plant, the amount of far-red light increases and signals the plant to grow taller and elongate to reach for more sunlight.