1) Well, since plants depends on photosynthesis to survive, if something were to interfere with the photosynthesis, the plant can and will die. Since there is no/barely water getting to the plants, 1), they are dehydrated and are dry from the heat and light of the sun. 2) H2O (water) is needed in the process of photosynthesis in the chloroplast. Without the H2O, the chemical in the photosynthesis can't be completed, meaning that no water=no oxygen, and no oxygen=no sugar. So when the chemical in the plant can't continue, then photosynthesis can't be complete, causing the under watered plants to die.
2) When it's a hot day, the stomas in the plants will close in order to hold water. When this happens, it limits the access to CO2 which reduces photosynthetic yield. CO2 concentrations in the air spaces which causes the leaf to decrease, but causes the concentration of oxygen released to increase. It's known that this process is wasteful in the leaf, it's called photorespiration.
How is water used in PS?
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