why do plants need water and sunlight

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 Adults take it for granted that plants need sunlight and water to live and grow, however young children, to whom the world is still new, may yet be coming to an understanding and appreciation of this basic fact. This project is a vivid, concrete introduction to this important knowledge. What do plants need to grow? What happens to a plant that does not have sunlight or water?


Twelve small, easy and fast to grow plants in pots (bean plants work well). Really only four plants are necessary, but it s good to have the extras in case one or two don t make it for reasons outside of the experiment. A dark place (e. g. a closet) Begin with 12 small, healthy plants. Divide them into four groups. Label the pots with words or simple pictures, three pots each: sun, water, sun and water, nothing (neither sun nor water). Keep the sun plants in the sunny spot; keep the others in the dark place. Water the water plants daily or as necessary for your climate.


Do not water the others. Check on the plants daily and record your findings in a chart labeled with the date along the left and each of the four categories along the top. (Younger children may of course need help with this. Alternatively children may periodically make drawings of the plants that an adult can then post in a large wall chart. ) Some observations you might make: What color are the plants? How tall are they? Are they getting new leaves? How do they feel (brittle, fleshy)? Continue the experiment for as long as is necessary/appropriate.