Imaan khan and Alhamza al Baghdady Presence of water

PRESENCE OF WATER IN PLANTS Why do they need water ? Plants need water to grow and also to dissolve the minerals in the soil which is taken up by the roots to all part of the plant. Where do they get water from? Plants get their water from the soil that is taken up by the roots of the plant. Why is water important ? Water is important to plants as need it to photosynthesise because it is one of the building blocks for the plant to make glucose. Glucose is important for the plant as it provides the plant with a food source.

How do plants take up water Plants absorb water from the soil by osmosis. Root hair cells are adapted for this by having a large surface area to speed up osmosis. The absorbed water is transported through the roots to the rest of the plant where it's used for different purposes: It's a reactant used in photosynthesis It supports leaves and shoots by keeping the cells rigid It cools the leaves by evaporation It transports dissolved minerals around the plant

How does water have an affect on plant growth Hypothesis I predict that as the volume of water increases the plants growth will also increase this is because more water going in through the plant roots will increase the rate of photosynthesis because more glucose is made for the plant to make new stems and cells. I also predict as the volume of water decrease the plant growth will decrease, causing the plant to wilt. This is because the plant will not have enough water to photosynthesise and make any glucose.

Method Were going to use 6 of the same plants (spider plant) that are roughly the same size to start off with, the plants will have the same amount of soil, sunlight, temperature and carbon dioxide. but different amount of water ( 2cm, 5cm, 10cm, 20cm, 50cm) . The plants will be watered three times a day for three weeks. We will measure the leaves of each plant with a ruler, and record the measurements in the results table. At the end of the investigation we should see that the plant with no water and the highest amount of water would wilt an possibly die . This is because there is no water for photosynthesis to occur. We think that the plant with the highest rate of growth would be the plant that is watered with 10 cm of water twice a day.