why very light fumes are visible from the ground of garden in a very sunny day
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Answer:
Balancing photosynthesis and transpiration rates
Plants face a dilemma when it comes to water relations. For plants to perform photosynthesis, they must keep their stomata open so they can take in carbon dioxide. But leaves must also retain a certain amount of water internally, to maintain turgor pressure and to provide water for photosynthesis. The result is that, on a sunny day when the plant is photosynthesizing like crazy, the plant is losing lots and lots of water, as water vapor is released through the open stomata. The plant can close its stomata to conserve water—but then photosynthesis would stop for lack of carbon dioxide. (This is what happens when temperatures rise above about 85 degrees F for many plants. Some desert plants have special adaptations to continue photosynthesizing in hot, dry weather.)
Rates of transpiration and water loss vary depending on the temperature of the air, humidity, wind, and the amount of leaf surface area. On a hot, dry, sunny day with a warm breeze, plants with large leaves lose a tremendous amount of water. On a cool, cloudy, humid day, plants transpire far less. You can get a sense of your plants’ transpiration rates by noting how you feel outdoors. On hot, sunny days you know you need to drink lots of fluids. Add to those conditions very low humidity and a steady wind (which increases surface evaporation) and you’d better drink even more!
Now you know why plants need so much water, as well as some of the environmental conditions that affect transpiration rates and therefore water requirements. So don’t get too irritated with your horticultural advisors, who tell you to keep your plant’s soil "evenly moist," rather than giving you specific amounts of water to apply. Who can predict your plant’s rate of transpiration!
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Answer:
IDK
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