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Maximum solar energy is trapped by:

1. planting trees
2. cultivating crops
3. growing algae in tanks
4. growing grasses

Correct answer: growing algae in tanks

Solution

Algae have a very high photosynthetic efficiency and a large surface area-to-volume ratio, so they can capture more solar energy per unit area than land plants. Growing them in tanks also allows optimal control of light, nutrients, and carbon dioxide, maximizing energy capture.

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