BECE (Ghana) Respiration — practice questions

Explore 2 free Respiration questions in BECE (Ghana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Respiration questions and exercises with answers

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Besides energy, what else does respiration produce?Read the answer and worked solution →A learner says plants photosynthesise by day and respire only by night. What is wrong with that idea?Read the answer and worked solution →

Worked practice questions

Besides energy, what else does respiration produce?

Oxygen gas and glucose
Nitrogen gas and starch
Water vapour and starch
Carbon dioxide and water

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Correct answer: D. Carbon dioxide and water

1. Respiration releases the energy stored in glucose using oxygen. 2. Two other substances are made at the same time as by-products. 3. They are carbon dioxide and water. 4. Oxygen and glucose are used up in respiration rather than made by it. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Products of respiration_

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A learner says plants photosynthesise by day and respire only by night. What is wrong with that idea?

Plants respire by day and by night
Plants respire only when in bright light
Plants never respire, they only feed
Plants respire only when they are old

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Correct answer: A. Plants respire by day and by night

1. Photosynthesis needs light, so it can only happen during daylight hours. 2. Respiration needs glucose and oxygen, neither of which depends on light. 3. Every living organism releases energy by respiration all the time. 4. So a plant respires by day as well as by night. 5. During the day a plant does both processes at once. 6. A plant that never respired would have no way of releasing energy from its food. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Respiration_