Help with AS Level Biology on Water Loss.

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username2315623
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#1
Report Thread starter 5 years ago
#1
1.) Insects limit water loss by having a small surface area to volume ratio. Why is this not a feasible way of limiting water loss in plants.

Could anyone help with this please?

Thanks!
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TraceyL
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I think it's because plants require a large surface area to volume ratio in their leaves to maximise sunlight absorption for photosynthesis so they would be decreasing the photosynthesis rate even if they are able to retain enough water. Though I would say some plant do make use of a small SA:VOL ration in some climates like tundra to reduce water loss, but they don't rely solely on this feature, e.g. cacti store their water and have waxy cuticles. Also, plants to need to regulate water loss throughout the day as the transpiration stream is important to transport dissolved minerals etc. and a small SA:VOL ratio alone doesn't enable them to regulate it as effectively.
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