... Plants control the water loss through these stomata by being able to close them up. When the water levels in the plant drop, the cells become flaccid they shrink. When the guard cells become more flaccid then the stomata shrink ...

... light intensity, the amount of carbon dioxide present, Light colour, minerals in the water, chemicals in the water, Health of plant, size of plant and the amount of water . I will be investigating the light intensity. The other most ...

... only slight which shows the average temperature drop when another layer was added was not as a dramatic decline. From then on, as each layer is added, increasing the thickness the decline in the average temperature drop is not as ...

... force of kinetic energy which provide a greater rate for the pigments to collide in which speed up the reaction through the phospholipuid bi-layer. However, if the temperatrue is too high, the proteins will be denatured and as a result ...

... Planning Aim An experiment to investigate how the water content of soil within a system of sand dunes affect zonation and succession. Introduction This investigation will take place ...

... test the hydrogen carbonate should be the same volume every time, make sure the beaker with the Elodea in is the same distance from the lamp. The weed should be cut at the stem before being put in the beaker. ...

... itself could have an affect. The warmer the sweat, the less heat energy needed from the body for evaporation to take place. So heat would be kept in the body longer. If it is a low temperature, then it would ...

... time and in the right order. There are in fact, two different stages of photosynthesis, one light stage and one dark stage. This means that it is much more likely that the reaction will take place as it is broken ...

... There will be a maximum level of photosynthesis during the experiment it is called a limiting factor. This factor will prevent the rate of photosynthesis from rising above a certain level, even if the conditions are improved to meet the ...

... thin and flat to provide a large surface so it can soak up lots of sunlight. 2. The palisade cells are arranged near the top of the leaf and are full of chloroplasts, essential for photosynthsis. 3. The guard cells, on the ...

... stops the heat of the water (although only a small quantity) from the lamp bulb. Fixed Variables- Carbon Dioxide- CO2 concentration can affect the rate of photosynthesis since the more CO2 in the air, the more CO2 that can diffuse into the ...

... the poles of two clamps. This was done to allow the leaves to do active transpiration. They were then placed in position where all the leaves will get the same amount of light, carbon dioxide and heat. The readings were taken ...

... 3 minutes are over I will be taking readings on how many bubbles come out of the weed every 30 seconds and I will be taking ten readings. After I have took all these reading I will do the same ...

... chloroplasts in the leaf, the chlorophyll traps the light, which will then make the energy from the light available for chemical reactions to take place in the plant. Therefore, if the amount of light is increased, from the bulb in ...

... can affect the rate of reaction in two different ways either by the leaves having varying surface area or varying thickness e.g. some leaves are fleshier than others. * The petiole sizes can be different and the bigger the petiole, the ...

... leave the plant subjected to the required light intensity for 3 minutes prior to measuring and recording the volume of oxygen produced. To allow it to photosynthesise at its optimum rate. To make it a fair test the plant was ...

... and would only allow non-polar substances to pass through. As anthocyanin is a polar substance, it cannot leave the cell by diffusion. Active transport is the next possible way for the dye to leak out, but this process requires energy, ...

... blue-black, which means glucose had been produced. And when iodine solution is added to the decolourised plant with limited light, it stayed reddish brown, which showed that glucose had not been produced. This prediction could also be proven by an ...

... C6H12O6 to produce CO2 and H2O. There will always be adequate O2 around a healthy plant, as it will be producing it during photosynthesis. Salinity of soil: Osmosis is the key process in determining the speed at which a plants root system ...

... an extra and intracellular part. Extrinsic membrane proteins are embedded in the outer phospholipid layer. They are fixed to one side of the bilayer or one depth of the bilayer. They can often act as chemical receptors for the cells. The ...

... embedded in the outer layer. They can often act as chemical receptors for the cells. The majority of the proteins in the membranes are globular. This will mean that the 3 dimensional shape of the structured protein held together by the ...

... the above locations are in the Epping Forest region based in the County of Essex. The first location studied was Furze Ground situated in a rural area, Debden Brook River, where two different areas were studied, upstream and downstream. In both ...

... I have also found out quite a lot about the different ways that heat can escape, as this will help my investigation if I know some background knowledge. There are three main ways in which heat can escape from bodies ...

... a certain point; photosynthesis will stop increasing and will be at a constant rate. This is because light is a limiting factor of photosynthesis. Apparatus * Pond Weed (elodea) * Ray box and Power Pack * Beaker (300ml) * Water (300ml) * Thermometer * Funnel * Test Tube * ...

... light comes as light energy and is converted into chemical energy to convert the water and C02 into Glucose and Oxygen, which is just a by-product. Furthermore, because of this, the greater the amount of Light, the more conversion there ...