... the amount of chlorophyll in the plant will affect the results but the same plant section will be used throughout the experiment. The temperature at which the experiment takes place will affect the rate of reaction. The heat gives energy to ...

... which are not tightly compact and instead have many air spaces necessary for gaseous exchange (to allow exchange of carbon dioxide and oxygen for photosynthesis and respiration). The air in the internal spaces of the leaf has direct contact with ...

... the sample line is measured and its species recorded. At each sample line, 3 at 3 randomly selected points the pH and temperature are recorded and an average calculated for each to prevent bias. There are a number of variables in ...

... is moved downstream. This is common where the stream is bordered by gallery forest A flowing freshwater stream is all business. It rushes forward. If it slows at all, it is just to create small whirlpools or eddies and then it's ...

... possible from the water deficient habitat. Furthermore Marram grass has a thick waxy cuticle, reducing water loss by evaporation and also, because it is shiny, reflects some of the heat. Sand Dune Succession Sand is deposited by the sea on the shore, ...

... possible from the water deficient habitat. Furthermore Marram grass has a thick waxy cuticle, reducing water loss by evaporation and also, because it is shiny, reflects some of the heat. Sand Dune Succession Sand is deposited by the sea on the shore, ...

... see the factors that affect photosynthesis: * Light - quantity and quality (colour) * Temperature - needs to be at an optimum for the plant enzymes * CO2 - the amount of (not usually limiting, but in excess) * H2O - amount of (not ...

... properly. I will investigate the affect light intensity has on the rate of photosynthesis. I plan to measure the rate of photosynthesis by counting the amount of oxygen bubbles produced in a minute when the light intensity differs. Aim To investigate the affect ...

... respiration not to take place. However if the temperature is less than around 30ºC it shall mean that the enzymes work slower and therefore the reactions will be slower and the energy produced by respiration shall decrease. Preliminary investigation In the ...

... respiration not to take place. However if the temperature is less than around 30ºC it shall mean that the enzymes work slower and therefore the reactions will be slower and the energy produced by respiration shall decrease. Preliminary investigation In the ...

... of photosynthesis. The water is gathered by the plant's roots. Carbon dioxide is gathered from the air through the stomata. The leaf uses chlorophyll and sunlight to change the water and carbon dioxide into oxygen and glucose (sugar). This sugar is ...

... the same because the same lamp will be used. Carbon dioxide is needed because the element are needed to produce glucose which is what the plant is trying to make. This can be controlled by having a fixed amount of sodium ...

... pondweed produces. A lamp is then set up 50cm away from the beaker, pointing at the pondweed, and turned on to provide a controlled amount of light to the pondweed. Finally, to measure the amount of oxygen given off ...

... may provide the opportunity for more or less insects to be caught in the fishing net. This is due to a longer period time may mean more rocks are dislodged and possibly more insects too, that may drift into the ...

... This can be converted into proteins for growth, broken down into carbon dioxide and water for energy production, or built up into starch for storage. A waste product of oxygen is also released. The structure of a leaf Plan Oxygen is the only ...

... being selectively permeable. Here is a diagram of the cell membrane: As you can see the cell membrane is made up of a phospholipid bilayer which the extrinsic and intrinsic proteins span through. Some of the extrinsic proteins act as antigens ...

... being selectively permeable. Here is a diagram of the cell membrane: As you can see the cell membrane is made up of a phospholipid bilayer which the extrinsic and intrinsic proteins span through. Some of the extrinsic proteins act as antigens ...

... and I will keep the same light intensity. Method: I will collect a test tube and a clamp stand. I will put the test tube in the clamp stand then put the pond weed and the pond water in the test ...

... we call this the independent variable. I will accomplish this by moving the lamp closer to the beaker containing the pondweed. Sunlight plays a much larger role in our sustenance than we may expect: all the food we eat and ...

... been added. 2cm celery extracts are used because it enables you to break down hydrogen peroxide this is because celery has a tissue, which contains an enzyme, catalyse, an enzyme is a molecule, which speeds up a reaction. Catalyse is found ...

... heat to pass through the walls of the beaker and out to the surroundings. Materials that are good thermal conductors tend to be good electrical conductors; metals such as gold, silver and copper have a high thermal conductivity's and will ...

... my preliminary work and experiments that I did in year nine, where I took two plants and placed them in exactly the same conditions, except one was deprived of sunlight. At the end of my experiment, I discovered that the ...

... solution containing a source of carbon dioxide to the water changing the ratio each time to see the effect. Wavelength - this would be testing the wavelength of different coloured light. This could be used to see which is the ...

... containing a source of carbon dioxide to the water changing the ratio each time to see the effect. Wavelength - this would be testing the wavelength of different coloured light. This could be used to see which is the most ...

... then I divided by four to get the average for sixty minutes not two hundred and forty. Average rate of oxygen produced in 60 minutes: Concentration of NaHCO Average rate of O produced (mol/dm3) in 60minutes (cm3) 0 0.5 0.1 1.6 0.2 2.9 0.3 4.5 0.4 5.8 0.5 6 Conclusion Having studied these results I can see that ...