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Transport in Plants — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYTransport in Plants2 Marks
Question
Photosynthesis needs constant water supply but transpiration can hamper this supply. How do plants of desert areas manage to get sufficient water inspite of faster transpiration?
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Answer

Desert plants have a different mechanism of photosynthesis and follow the $C _4$ pathways. The evolution of the $C _4$ photosynthetic system is probably one of the strategies for maximising the availability of $CO _2$ while minimising water loss. $C _4$-plants are twice as efficient as $C _3$-plants in terms of fixing carbon (making sugar). However, a $C _4$-plant loses only half as much water as a $C _3$-plant for the same amount of $CO _2$ fixed.

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