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 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