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Difficulty: MediumPlant Biology and Photosynthesis

Chlorophyll is the primary pigment responsible for capturing solar energy in plants. Which statement correctly explains why most plant leaves appear green to the human eye?

  1. A
    Chlorophyll absorbs green light to synthesize sugars while reflecting all other wavelengths.
  2. Chlorophyll reflects green light wavelengths while absorbing blue and red light wavelengths for energy.Answer
  3. C
    Mitochondria within leaf cells produce green pigmentation during cellular respiration.
  4. D
    Plant cell walls emit green wavelengths when water travels through vascular tissue.

Answer

Chlorophyll reflects green light wavelengths while absorbing blue and red light wavelengths for energy.
An object appears as a specific color because it reflects those wavelengths of light while absorbing others. Chlorophyll, the main photosynthetic pigment located in chloroplasts, absorbs light predominantly in the blue and red regions of the visible spectrum to power photosynthetic chemical reactions. Green light is largely reflected rather than absorbed, allowing it to reach the human eye and make plant foliage appear green.

Step-by-Step Solution

1
Identify the primary function and optical properties of photosynthetic pigments.
Chlorophyll inside chloroplasts captures visible light to convert into chemical energy.
An object's observed color depends on which wavelengths of white light are reflected into an observer's eyes versus absorbed by the material.
2
Determine which wavelengths of the visible light spectrum chlorophyll absorbs and reflects.
Chlorophyll strongly absorbs red and blue light and reflects green light.
Because green wavelengths are not efficiently absorbed by chlorophyll, they bounce off the leaf surface and are perceived by the human eye.

Key Concept

Light absorption and reflection characteristics of chlorophyll in photosynthesis
Estimated Time:45s
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Topics

Plant Biology and Photosynthesis

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