The diagram shows part of a plant with a woody stem, which does not have enough water. The leaves have wilted, but the stem is still firm and upright.
Why have the leaves wilted?
1 )
Photosynthesis cannot take place without water.
The cells in the leaves have lost their internal pressure.
3 )
The humidity in the air is too high.
4 )
The lignin in the leaves has become soft.
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