Respiring seeds in a thermos flask raise the temperature of their surroundings because
- A. photosynthesis gives off heat
- B. the seed coat is an insulator
- C. cellulose decomposes spontaneously
- D. respiration releases part of glucose's energy as heat
Explanation
Only a fraction of the energy released in respiration is trapped in ATP; the rest escapes as heat, which germinating seeds in bulk can visibly produce. Photosynthesis cannot occur in darkness, so warmth in a flask of seeds is respiration measured.
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