Photosynthesis is the process by which plants make food, initially in the form of glucose , for themselves, and for most animal life, including us too via food chains! To show that light is needed for photosynthesis From your stock of ‘de-starched’ plants, you keep one in the dark and one into bright sunlight or artificial light. In this particular experiment, a de-starched plant is covered using a transparent plastic bag or a glass jar. Photosynthesis chemical reactions cannot happen without the help of enzymes. This graph shows the trend and pattern that occured betwen the unfiltered light and the green light.

Posted August 2, Make sure that no Bunsen burners are turned on as the ethanol is highly flammable. This is shown by the graph line becoming horizontal, and the maximum rate is now dependent on the temperature ie the higher the temperature the greater the maximum rate of photosynthesis possible. By spitfirxe , August 18, in Biology. Replace the plunger into the barrel leaving only a small amount air, but do not crush the leaf discs. The chemistry of photosynthesis is very complicated but it takes place in two main stages. Practical – Investigation of factors affecting photosynthesis Investigate the effect of light intensity on the rate of photosynthesis using an aquatic organism such as pond weed.

During photosynthesis light energy is absorbed by the green chlorophyll, which is found in chloroplasts in some plant cells and algae. In this ‘set-up’ you measure the rate of doursework by carbonste the rate of oxygen production as the gas is collected in the gas syringe.

You can calculate the relative intensity using the inverse square law, see light intensity section on this page. Graphs of rate of photosynthesis versus distance of the lamp from experiments such as method 3.

photosynthesis coursework sodium hydrogen carbonate

Palisade cells in the mesophyll contains lots of chloroplasts containing chlorophyll – so palisade cells are well adapted for photosynthesis. This means plants make their own food! Make a diluted solution of liquid detergent.


The Effect of the Amount of Sodium Bicarbonate (baking soda) on Photosynthesis by A R on Prezi

In this particular experiment, a de-starched plant is covered using a transparent plastic bag or a glass jar. Rate of photosynthesis versus light intensity at different temperatures 2 factors Initially the graph lines are linear as the rate of photosynthesis is proportional to the light intensity see also Graph 1.

What does the plant do with the glucose produced by photosynthesis using sunlight energy? The general points about investigating the three variables were described in method 1. Log In Sign Up. Epidermal tissues are the outer layers which cover the whole plant. This shows carbon dioxide is need for photosynthesis.

A greenhouse warms up by trapping the heat radiation from the sun – the ‘greenhouse effect’.

photosynthesis coursework sodium hydrogen carbonate

A plant can’t photosynthesise at night, so it needs energy from somewhere to stay alive at night! The volume of oxygen produced could be measured by collecting the gas produced in a gas syringe. From the rate of movement of the bubbles you get an estimate of the rate of production of oxygen as a measure of the rate of photosynthesis. Discussion Effect of bicarbonate on photosynthesis The rate of photosynthesis is affected by a number of factors. Posted August 29, The graph also shows that the relationship between rate of photosynthesis and lamp distance is not linear.

At temperatures over 40 o C enzymes involved in the process are increasingly destroyed, so photosynthesis slows down and eventually stops because the photosynthesis enzymes are destroyed. The leaves will show that no starch has been made, as no photosynthesis has occurred. These experiments and graphical data analysis are discussed in detail further down the page.


With a teat pipette, spot a few drops of iodine solution onto the leaf. The tube of pondweed is immersed in NaHCO 3 solution is subjected to a lamp emitting bright white light at a specific distance from tube of pondweed. A thermostated water bath would be ideal. The teacher may need to do this ahead of time. Ideally in greenhouses you would want the optimum temperature, a constant adequate supply of carbon dioxide and plenty of light – hence the use of transparent glass!

A lamp with an LED bulb is set up at different distances from the plant in a beaker of water. This factors include light intensity, temperature, availability of nutrients such as CO2, and availability of water.

Effect of Sodium Hydrogen Carbonate Concentration on the Rate of Photosynthesis

Devise your own hypothesis and experiment, and we can give you advice on it. You should be able to get enough results eg 5 o increments from 15 o C to 50 o C to show maximum the maximum rate of photosynthesis expected to be around o C.

The glucose produced in photosynthesis may be converted into insoluble starch for storage in leaves, roots and stems. To investigate if a plant needs carbon dioxide for photosynthesis, we need to create conditions for the plants where carbon dioxide is present in one test and absent in another.

However, the light level with have its limit either sunlight or artificial light at hydrkgenso for maximum effect you may still need a warm temperature and a fresh supply of carbon dioxide.

It is assumed that the sodim of oxygen production is proportional to the rate of photosynthesis.