Answer: A) Autotrophs transform radiant energy into chemical energy, but heterotrophs can’t.
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Autotrophs are producers and can produce their own food, usually using sunlight. Heterotrophs cannot produce their own food and depend on autotrophs for food.
Since sunlight is a form of radiant energy, and autotrophs use sunlight to make food (which is/can be chemical energy), the first choice is true.
The second choice is not true because autotrophs use carbon dioxide to produce food. The third choice is not true because some heterotrophs use an electron transport system in their mitochondria to generate ATP. The fourth choice is not true because the Calvin cycle is a step of photosynthesis, which is a process used by autotrophs, so they must have a Calvin cycle.
