Is the statement 'In healthy plants, photosynthesis and cellular respiration occur at the same time or equal rates' true?

Is the statement 'In healthy plants, photosynthesis and cellular respiration occur at the same time or equal rates' true?

• A. True
• B. False
• C. Only in roots
• D. Never occur simultaneously

Answer: (B)

Plants perform both photosynthesis and cellular respiration, but they do not run at equal rates under all conditions. During daylight, photosynthesis is actively converting light energy into chemical energy, building sugars in the chloroplasts, while respiration continues in mitochondria to meet the plant’s energy needs. Importantly, the rate of photosynthesis typically exceeds the rate of respiration, leading to a net production of sugars and oxygen. In the dark, photosynthesis stops while respiration keeps occurring, so the two processes are not happening at the same rate. Roots don’t perform photosynthesis at all, so saying it happens only in roots is inaccurate. And they can occur simultaneously in the same plant under light, so saying they never occur at the same time is not correct. Therefore, the statement is false.

Plants perform both photosynthesis and cellular respiration, but they do not run at equal rates under all conditions. During daylight, photosynthesis is actively converting light energy into chemical energy, building sugars in the chloroplasts, while respiration continues in mitochondria to meet the plant’s energy needs. Importantly, the rate of photosynthesis typically exceeds the rate of respiration, leading to a net production of sugars and oxygen. In the dark, photosynthesis stops while respiration keeps occurring, so the two processes are not happening at the same rate. Roots don’t perform photosynthesis at all, so saying it happens only in roots is inaccurate. And they can occur simultaneously in the same plant under light, so saying they never occur at the same time is not correct. Therefore, the statement is false.