Discussion Effect of bicarbonate on photosynthesis The rate of photosynthesis is affected by a number of factors. The fundamental life processes of plants and animals depend on a variety of chemical reactions that occur in specialized areas of the organism’s cells. You do need some ventilation or the level of carbon dioxide gas will fall if the air is not replenished as the carbon dioxide is used up by the plants. Make sure that no Bunsen burners are turned on as the ethanol is highly flammable. The palisade cells are near the top of the leaf and exposed to the most light.

The almost white leaf is rinsed with cold water and laid out on a filter paper. BUT take care that the greenhouse does not get too hot eg by opening ventilation systems or putting up shades. Remove the plunger and place leaf discs into the barrel. Through growth and accumulation of these larger molecules biomass is built up in plants and algae. This factors include light intensity, temperature, availability of nutrients such as CO2, and availability of water. Sign in Already have an account?

Cohrsework the light intensity is quite difficult, you need to position a lamp at different measured distances away from the pondweed tube.

The effect of light intensity on photosynthesis can be investigated in water plants.

Effect of Sodium Hydrogen Carbonate Concentration on the Rate of Photosynthesis

The leaves will show that no starch has been made, as no photosynthesis has occurred. What is the purpose of a control in this experiment? Investigate the effect of light intensity on the rate of photosynthesis using an aquatic organism such as pond weed.

What is the effect of wavelength on photosynthesis? See also Diffusion, osmosis, active transport, exchange of substances – examples fully explained. How do you design an experiment to monitor the rate of photosynthesis?


photosynthesis coursework sodium hydrogen carbonate

Pull a small volume of sodium bicarbonate solution. Try using different color filters to generate light of varying wavelengths. Photosynthesis utilises sunlight energy to convert carbon dioxide and water into glucose basis of food and oxygen most of it a waste gas to plants, but vital for respiration for us and other animals!

I think a light meter is essential for accurate results – changing the lamp distance is relevant to changing the light intensity, BUT, intensity is NOT a simple function of distance. The spongy mesophyll tissue also contains air spaces that help increase the rate of diffusion of gases in and out of the leaves.

Hi, i’m investigating the effects of Sodium Hydrogen Carbonate also known as sodium bicarbonate on the rate of photosynthesis.

photosynthesis coursework sodium hydrogen carbonate

Ocursework the speed of the horizontal movement of the gas bubbles is quite easy via the accurate linear scale and stopwatch. Go To Topic Listing Biology. This means plants make their own food!

Photosynthesis – Eduqas – Revision 4 – GCSE Biology (Single Science) – BBC Bitesize

phoyosynthesis The graph shows a sample of the data observed during the experiment. This is shown by the graph line becoming horizontal, and the maximum rate is now dependent on the light intensity ie the higher the light intensity the greater the maximum rate possible.

You can measure the speed of an air bubble by the scale.

photosynthesis coursework sodium hydrogen carbonate

Since the graph line has become horizontal flattened outthis also means that light intensity is no longer the limiting factor – you must increase carbon dioxide concentration or temperature to increase the rate of photosynthesis. You need to be a member in order to leave a comment.

For these experiments a suitable temperature must be chosen and kept constant! Use coloured acetate filters to investigate the effects of the blue, green and red parts of the spectrum on photosynthesis.


However, the leaf from the plant in the bell jar should not give the blue-black colour hydrogwn iodine solution – showing photosynthesis to form starch had not taken place despite having access to light. Control – A light bulb without a filter was used as the source of energy.

The epidermal tissues are covered with a couraework cuticle which helps reduce the loss of water by evaporation. It is assumed that the rate of oxygen production is proportional to the rate of photosynthesis.

Note that to produce proteins, plants also use nitrate ions that are absorbed from the soil. The air contains 0. So 3 three factors can be manipulated to increase the rate of photosynthesis and hence increase plant growth. If the temperature gets too high photosynthesis will slow down due to enzyme damage. From the graph of volume of oxygen versus time you measure the initial gradient to calculate the rate of production of oxygen as a measure of the rate of photosynthesis.

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 volume of oxygen produced could be measured by collecting the gas produced in a gas syringe.