AP BIOLOGY

Detailed explanation-1: -The answer is blue and red. The colors that plants best absorb are blue and red. The photosynthetic pigments (like chlorophyll present in the chloroplast of plant cells) are responsible for absorbing specific light wavelengths from the visible spectrum.

Detailed explanation-2: -Special pigments in chloroplasts of plant cells absorb the energy of certain wavelengths of light, causing a molecular chain reaction known as the light-dependent reactions of photosynthesis. The best wavelengths of visible light for photosynthesis fall within the blue range (425–450 nm) and red range (600–700 nm).

Detailed explanation-3: -Blue and red lights differently regulate leaf photosynthesis. Previous studies indicated that plants under blue light generally exhibit better photosynthetic characteristics than those under red light.

Detailed explanation-4: -Blue light plays an important role in most plant functions. Blue light is highly absorbed by both chlorophyll a and b, as well as an intact leaf system. This high absorption rate corresponds to the photosynthetic action spectrum from isolated chloroplasts and intact leaves.