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Nature & Animals

Which effect occurs when photorespiration outcompetes carbon fixation in plant chloroplasts at high temperatures?

A)Decreased photosynthetic efficiency
B)Increased ATP production rate
C)Enhanced synthesis of glucose molecule
D)Accelerated decomposition of chlorophyll

💡 Explanation

When temperatures rise, rubisco binds more readily with oxygen rather than carbon dioxide in a process called photorespiration because of reduced CO2 solubility, reducing fixed carbon. Therefore, decreased photosynthetic efficiency results, rather than increased ATP production, enhanced glucose synthesis, or chlorophyll decomposition, which depend on efficient carbon fixation.

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