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Difficulty: MediumPlant Biology and Photosynthesis

In green plant tissues, the specialized pigment chlorophyll is concentrated within the thylakoid membranes of chloroplasts. What is the primary function of chlorophyll during photosynthesis?

  1. A
    It serves as a rigid structural barrier that protects the plant cell from bursting under high osmotic pressure.
  2. B
    It breaks down stored sugar molecules to release usable ATP energy during cellular respiration.
  3. It absorbs radiant light energy to energize electrons and initiate the synthesis of chemical energy.Answer
  4. D
    It binds directly to carbon dioxide in the air to release oxygen gas during nocturnal respiration.

Answer

Chlorophyll functions to absorb radiant light energy to energize electrons and initiate the synthesis of chemical energy.
Chlorophyll is the primary photosynthetic pigment in plants; it absorbs solar radiation (predominantly in the blue and red portions of the electromagnetic spectrum) and converts this radiant energy into excited electrons to power the production of ATP and NADPH.

Step-by-Step Solution

1
Identify the primary biological role and location of chlorophyll in photosynthetic organisms.
Chlorophyll is a specialized green pigment embedded in the thylakoid membranes of chloroplasts that captures photons of light.
Photosynthesis requires an initial input of radiant energy from sunlight to drive subsequent biochemical reactions.
2
Differentiate the function of chlorophyll from other plant structures and metabolic processes.
Chlorophyll transfers absorbed light energy to excite electrons, whereas cell walls provide structural support, stomata regulate gas diffusion, and mitochondria execute cellular respiration.
Distinguishing organelle and pigment functions prevents confusing energy-capturing mechanisms with structural or respiratory functions.

Key Concept

Function of Chlorophyll in Light Absorption
Estimated Time:45s
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Topics

Plant Biology and Photosynthesis

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