Using what you i know about plant physiology, explain why the light compensation point is lower in shade leaves compared to sun leaves.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
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Using what you know about plant physiology, explain why the light compensation point is lower in
shade leaves compared to sun leaves.
Transcribed Image Text:Using what you know about plant physiology, explain why the light compensation point is lower in shade leaves compared to sun leaves.
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The compensation point for light is the level of illumination at which there is precisely no net production of oxygen. At this stage, the rate of oxygen production by photosynthesis and the amount of oxygen used by the plant as a result of cellular respiration are equal. However, there are some expenses associated with increased photosynthetic capacity in sun plants. As compared to shade plants, sun plants often have higher rates of leaf respiration, which raises the light-compensation point. Because shade leaves have a thinner coating of mesophyll cells and more chloroplasts, they are better able to capture sunlight at low radiation levels.The compensation point for light is the level of illumination at which there is precisely no net production of oxygen. At this stage, the rate of oxygen production by photosynthesis and the amount of oxygen used by the plant as a result of cellular respiration are equal. However, there are some expenses associated with increased photosynthetic capacity in sun plants. As compared to shade plants, sun plants often have higher rates of leaf respiration, which raises the light-compensation point. Because shade leaves have a thinner coating of mesophyll cells and more chloroplasts, they are better able to capture sunlight at low radiation levels.

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