why do plants need so much water

Why Do Plants Need Water? Why do plants need water? The easy answer is, because they re
made mostly of water. But let s take it a little further Why Do Plants Need Water? Reason 1: Germination Germination is the process of a newborn plant emerging from its seed. A seed needs water to activate the enzymes that orchestrate the germination process. Absorbed water also causes the seed to swell and soften which makes it possible for the plant to break through. Why Do Plants Need Water? Reason 2: Photosynthesis The enzymes contained within each seed give it enough juice to push the sprouting plant to the surface. After it gets there, light energy, carbon dioxide and water take over. Very generally put, photosynthesis (literally putting together or synthesizing light) produces food for the plant by combining light energy, carbon dioxide and water, each of which (along with nutrients from the soil) is needed in order for the plant to grow. Why Does a Plant Need Water? Reason 3: Nutrient transfer Water is a necessary conduit for the transfer of nutrients from the soil and into the root system.


Without it, the soil s nutrients could not be absorbed by the plant. Why Does a Plant Need Water? Reason 4: Transpiration Often confused with and not completely dissimilar from evaporation, transpiration is the process of water being pulled in through the roots, up the stem and out of the plant. It serves three main purposes: Causes nutrients and water to flow throughout the plant, thereby feeding and hydrating it Transpiration becomes evaporation the instant it leaves the surface of the plant and heads into the atmosphere. Was this page helpful? If so, please tell your friends about it with a Facebook like or via Twitter, Pinterest, email or good old fashioned word of mouth. Thank you for supporting our efforts! Also see. Sources: Definitions obtained from Answer 1: All living things need water to stay alive, and plants are living things! Plants, however, need much more water than many living things because plants use much more water than most animals.


Plants also contain more water than animals - plants are about 90% water. The amount of water a plant needs depends on the type of plant, how much light the plant gets, and how old the plant is. When plants are not watered properly they wilt. This is because of something called turgor, which is water pressure inside the cells that make up the plant's skeleton. Water enters a plant through its stem and travels up to its leaves. When a plant is properly hydrated, there is enough water pressure to make the leaves strong and sturdy; when a plant doesn't get enough water, the pressure inside the stems and leaves drops and they wilt. 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.

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