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Difficulty: EasyPlant Biology and Photosynthesis

Arrange the main stages of plant energy capture and food production in the correct sequential order from earliest to latest.

  1. 1Chlorophyll pigments inside chloroplasts capture radiant energy from sunlight.
  2. 2Absorbed solar energy is used to split water molecules, releasing oxygen as a byproduct.
  3. 3Carbon dioxide is combined with chemical energy carriers to synthesize glucose.
  4. 4Surplus glucose units are assembled into insoluble starch for long-term energy storage.

Answer

The correct sequence begins with chlorophyll absorbing sunlight, followed by the splitting of water to release oxygen, the conversion of carbon dioxide into glucose, and finally the assembly of excess glucose into storage starch.
The biochemical pathway of photosynthesis follows a strict chronological order: radiant solar energy is first absorbed by chlorophyll, enabling the photolysis of water and release of oxygen. Next, energy carriers power the Calvin cycle to convert carbon dioxide into glucose, and finally, excess glucose is polymerized into starch for storage.

Step-by-Step Solution

1
Identify the initial energy input stage of photosynthesis.
Chlorophyll absorbs radiant light energy from the sun.
Photosynthesis is an endergonic process that cannot begin without an external solar energy input.
2
Determine the subsequent light-dependent reaction.
Light energy splits water molecules, producing oxygen gas byproduct.
Water photolysis provides electrons and protons required to generate temporary chemical energy.
3
Identify the carbon-fixing synthetic stage.
Carbon dioxide is fixed into glucose sugar molecules.
The plant utilizes chemical energy carriers produced in earlier light reactions to synthesize carbohydrates.
4
Determine the final storage step for excess carbohydrates.
Surplus glucose is linked together into starch polymers.
Plants store excess manufactured sugars in the form of complex carbohydrates for later metabolic needs.

Key Concept

Sequential energy conversion and carbohydrate synthesis in photosynthesis
Estimated Time:45s
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Topics

Plant Biology and Photosynthesis

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