why do seeds need water to start growing

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 When embryos haven t fully developed, seeds must mature further before the embryo can sprout. Without stored nutrients inside the seed, it can t develop.

Orchid seeds are no larger than dust particles and only have one embryo inside each seed. These embryos need the nourishment of something like soil fungi to aid in development until they can penetrate the seed coating. Water allows the seeds to absorb nutrients from soil fungi, but it also softens the seed coating. Because these seeds have limited viability, the inside embryo will die without fast connection between the soil fungi and seed, a process made possible by water.

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