The organisms able to use sunlight directly as a source of energy are_____________?
Correct answer: A. Plants
- A. Plants
- B. Animals
- C. Omnivores
- D. Fungi
Explanation
Plants use chlorophyll to convert sunlight into chemical energy during photosynthesis, making them primary producers. Students may choose omnivores because they obtain energy through food, but animals cannot use sunlight directly as their main energy source.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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