why do plants need so much water

A few days ago we noticed that one of our little pumpkin plants on the window sill had wilted. PThe soil looked dry so we watered the plant and after a few hours it was standing lovely and straight again, which got us wondering why do plants need water. Plants need water to germinate. We saw this with our. Water is needed to activate the process of germination, it also softens the seed making it easier for the plant to break through. Photosynthesis Photosynthesis is the process by which plants make energy to grow. Photosynthesis requires sunlight, water and carbon dioxide. We demonstrated what happens when a plant cannot photosynthesise when we made our
Nutrient transfer Plants need water to absorb nutrients from the soil. Transpiration is the process by whichPwater moves up the stem of a plant from root to leaf when water is lost from the plant due to evaporation occurring at the leaves.


This continual flow of water and nutrients Pkeeps the plant s cells firm, if the cells become short of water they lose firmness and the plant starts to wilt. We can demonstrate transpiration by placing white flowers in coloured water, the water travels up the stem to the petals which become coloured like the water. Have you ever noticed your plants wilting? Did they revive after you watered them? Suitable for Key Stage 1 Living things and their habitats 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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