How does leaf position on a tree affect photosynthesis? Are the leaves that you are comparing adapted to growth in the sun or shade? Some plants display evolutionary adaptions to growth in bright sunshine or shade. Leaves of tree often show developmental adaptions to different conditions.
Photosynthesis involves the conversion of light energy into chemical energy.
The light from the sun is composed of a range of wavelengths colours. Chlorophyll is the main photosynthetic pigment.
Chlorophyll can absorb red and blue light more than green. Chlorophyll cannot absorb green light and so instead reflects it making leaves look green. Light energy is used to produced ATP and to split water molecules photolysis to form oxygen and hydrogen.
ATP and hydrogen derived from photolysis of water are used to fix carbon dioxide to make organic molecules. Photosynthesis can be measured in many ways as it involves the production of oxygen, the uptake of carbon dioxide and an increase in biomass.
For example, aquatic plants release oxygen bubbles during photosynthesis and so these can be collected and measured. The uptake of carbon dioxide is more difficult to measure so it is usually done indirectly.
When carbon dioxide is absorbed from water the pH of the water rises and so this can be measured with pH indicators or pH meters.
Finally, photosynthesis can be measured through an increase in biomass. If batches of plants are harvested at a series of times and the biomass of these batches is calculated, the rate increase in biomass gives an indirect measure of the rate of photosynthesis in the plants.
As temperature increases, the rate of photosynthesis increases more and more steeply until the optimum temperature is reached. If temperature keeps increasing above the optimum temperature then photosynthesis starts to decrease very rapidly. As light intensity increases so does photosynthesis until a certain point.
At a high light intensities photosynthesis reaches a plateau and so does not increase any more. At low and medium light intensity the rate of photosynthesis is directly proportional to the light intensity.
As the carbon dioxide concentration increases so does the rate of photosynthesis. There is no photosynthesis at very low levels of carbon dioxide and at high levels the rate reaches a plateau.The Effects of Carbon Dioxide on the Rate of Photosynthesis INTRODUCTION: Carbon dioxide is a necessary reactant in the process of photosynthesis This activity is designed to determine the effect, if any, of different amounts of carbon dioxide on the rate of photosynthesis.
Effects of Blue and Red Light on the Rate of Photosynthesis *Chlorophyll A; A type of chlorophyll that is the most common photosynthetic organisms predominant in all higher plants, red & green algae higher plants, red & green algae.
light: rate of photosynthesis increases as light intensity increases Explain the effect of light intensity and temperature on the rate of photosynthesis. 8 marks. IB BIology Year 1 Review - Essay Q Part 1. 8 terms. Photosynthesis. 17 terms.
IB Biology HL - Organelles. Read this essay on Lab Report: Photosynthesis. Come browse our large digital warehouse of free sample essays. Variables that can affect the process of photosynthesis include light intensity, temperature, and carbon dioxide levels.
* Variables: The dependent variable of this experiment is the rate of photosynthesis. The independent. The Plan In my experiment I am going to see how light affects the rate of photosynthesis.
To do this experiment I am going to set up the apparatus as shown in figure 1. The apparatus I am going to use are the following: 1 Tripod 1 ml Beaker 1 boiling tube 1 Clamp Stand 1 Clamp 1 Boss 1 Ring Binder 1 Lamp 1 1 Metre Ruler 1 Thermometer 1.
I want to find out if light intensity has any effect on the rate of photosynthesis. I want to know if the intensity of light is high, then will the rate of photosynthesis will be faster.
Further investigation is to find out various light intensities and the rate of photosynthesis by using coloured light filters.