why do we need to use a water plant for collecting the gas produced in photosynthesis?
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Answer:
The conversion of unusable sunlight energy into usable chemical energy, is associated with the actions of the green pigment chlorophyll. Most of the time, the photosynthetic process uses water and releases the oxygen that we absolutely must have to stay alive.
Plants also need water for photosynthesis. Photosynthesis is what plants do to create their
food, and water is critical to this process. Water enters a plant's stem and travels up to its
leaves, which is where photosynthesis actually takes place. Once in the leaves water
evaporates, as the plant exchanges water for carbon dioxide. This process is called
transpiration, and it happens through tiny openings in the plant's leaves, called stomata. The
water from the leaves evaporates through the stomata, and carbon dioxide enters the
stomata, taking the water's place. Plants need this carbon dioxide to make food.
Transpiration - this exchange of water for carbon dioxide - only occurs during the day when
there is sunlight. This is why you might find dew on plants in the morning. The plants contain
a lot of water because all night long water has been entering through the stem and being
pulled into the leaves where it can't evaporate. Since the water doesn't evaporate at night,
the water has no where to go so it remains on the leaves as dew.
When water evaporates from a plant during transpiration it cools the plant, in the same way
the humans sweat to cool off in the heat. A mature house plant can transpire its body weight
daily. This means it gives off a lot of water! If people needed that much water, an adult
would drink 20 gallons of water a day