Multiple Choice
Which of the following processes is most directly driven by light energy?
9. Quantum Mechanics
The Energy of Light
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What is the primary energy source that powers photosynthesis?
A
Heat energy from the environment
B
Mechanical energy from wind
C
Chemical energy from ATP
D
Sunlight
Verified step by step guidance1
Understand that photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose.
Recognize that the primary energy source for photosynthesis is sunlight, which is absorbed by chlorophyll, the green pigment in plants.
Recall that chlorophyll absorbs light most efficiently in the blue and red wavelengths, and this light energy is then used to drive the reactions of photosynthesis.
Differentiate between the types of energy mentioned: heat energy, mechanical energy, and chemical energy, and understand that none of these are the primary energy source for photosynthesis.
Conclude that sunlight is the correct answer as it provides the energy needed to convert carbon dioxide and water into glucose and oxygen during photosynthesis.
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