If a plant were to be exposed to only red light, would...

If a plant were to be exposed to only red light, would photosynthesis be possible?

a. Photosynthesis does not take place.
b. The rate of photosynthesis increases sharply.
c. The rate of photosynthesis decreases drastically.
d. The rate of photosynthesis decreases and then increases.

Key Concepts

Photosynthesis

Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy by synthesizing organic compounds from carbon dioxide and water. This process is crucial for the energy balance in ecosystems and depends on the capture of light by pigments to drive the chemical reactions.

Light Absorption by Pigments

Plants use pigments, primarily chlorophylls, to absorb light energy. These pigments have specific absorption spectra that allow them to capture certain wavelengths more efficiently, most notably in the blue and red regions of the light spectrum. The efficiency of photosynthesis is highly dependent on the wavelengths of light absorbed.

Wavelength and Energy in Light Reactions

The light-dependent reactions of photosynthesis rely on the energy provided by photons. Variations in wavelength affect the energy of the photons, and while red light carries enough energy to drive these reactions, a combination of light wavelengths, including blue light, is generally more effective because it optimizes the activation of all pigments and complements photosystem activity.

Monochromatic Light Exposure

When a plant is exposed to only red light, the absence of other wavelengths, especially blue light, can limit the overall efficiency of photosynthesis. Although red light is important and can drive photosynthetic processes, the lack of complementary wavelengths may result in a less than optimal rate of photosynthesis.

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