A student in Barbados placed germinating pigeon pea seeds in a sealed flask with limewater. After 24 hours, the limewater turned milky. What does this result demonstrate?

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Question

A student in Barbados placed germinating pigeon pea seeds in a sealed flask with limewater. After 24 hours, the limewater turned milky. What does this result demonstrate?

Accepted Answer

Carbon dioxide is produced during respiration — Award 1 mark for recognising that limewater turns milky in the presence of carbon dioxide. B is incorrect because oxygen is used, not released, in respiration. D is incorrect because water is produced, not absorbed. A is incorrect because nitrogen is not involved in respiration.

Answer

Oxygen is released during respiration

Answer

Carbon dioxide is produced during respiration

Answer

Water is absorbed during respiration

Answer

Nitrogen is released during respiration

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