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"An experiment to investigate how a factor affects the rate of photosynthesis"

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BIOLOGY COURSEWORK YEAR 11 BY ABHINAV SARASWAT TITLE: "AN EXPERIMENT TO INVESTIGATE HOW A FACTOR AFFECTS THE RATE OF PHOTOSYNTHESIS" PLANNING EXPERIMENTAL PROCEDURES Photosynthesis is a process in which plants make their own food. Photosynthesis uses carbon dioxide, water light and chlorophyll to produce glucose and oxygen. They do this by taking in the carbon dioxide (CO2) from the air around it. The plant also needs water (H2O) and light (either from the sun or from other sources such as a light bulb). Most of the plants food is made in the palisade cell, which is in the leaf of a plant. Leaves are perfect for photosynthesis because they are flat and thin providing a large surface area for the absorption of light and gases. Photosynthesis happens in the leaf because there are a large number of chloroplasts there, each chloroplast contains the green pigment chlorophyll that gives the leaf its green colour and also captures light energy for use in the process of photosynthesis. In photosynthesis the light absorbed by chlorophyll powers the reaction that converts water and carbon dioxide into glucose and oxygen. Both animals and plants for respiration use oxygen produced by photosynthesis. The word equation for photosynthesis is: Carbon dioxide + Water Glucose + Oxygen The balanced chemical equation for photosynthesis is: 6CO2 + 6H2O C6H1206 + 6O2 A ...read more.


By varying the amount of light and keeping other factors the same we will be able to how the intensity of light affects the rate of photosynthesis. APPARATUS The equipment that I will use for my experiment is listed below. * Lamp * 40cm ruler * Beaker * Water * Potassium hydrogen carbonate * Elodea (Canadian pondweed) * Light intensity meter * Stopwatch METHOD Set out the apparatus as shown in the diagram and then follow the procedure written below: 1. Set out the apparatus as shown in the diagram above. 2. Darken the room as much as possible so there is other source of light except from the lamp. Switch on the lamp. 3. Put some potassium hydrogen carbonate in the beaker with the water to supply the plant with carbon dioxide (carbon dioxide is one of the main factors that affect the rate of photosynthesis and by adding potassium hydrogen carbonate in the water we can keep the amount of carbon dioxide the same). 4. Place a paper clip at the end of Elodea to avoid it from floating to the top and to also avoid the release of oxygen bubbles from the end. Add the Elodea to the water. Put a light intensity meter in front of the beaker, the beaker and the light intensity meter should be as close to lamp as possible. ...read more.


I will measure the intensity of the light by using a light intensity meter. I will also measure the number of oxygen bubbles and I will do this three times. The results that I will take should be reliable enough to write a good conclusion. INFORMATION USED The information that I have used in this investigation is from the Heinemann biology textbook, CJP biology revision guide and also from the notes in my notebook. OBTAINING EVIDENCE RESULTS I have obtained the following results from my experiments: Distance of beaker from the lamp (cm) Light intensity Number of oxygen bubbles produced by the plant (per minute) 1st run 2nd run 3rd run 0 4.5 61 65 64 10 3.1 35 34 39 20 2.5 15 18 15 30 2 8 9 9 40 1.6 1 2 0 I have worked out the mean number of oxygen bubble per minute and I have recorded that in the table below: Distance of beaker from the lamp (cm) Number of oxygen bubbles produced by the plant (per minute) Mean number of oxygen bubbles produced by the plant (per minute). (Nearest whole number). 1st run 2nd run 3rd run Working 0 61 65 64 (61+65+64) 3= 63 10 35 34 39 (35+34+39) 3= 30 20 15 18 15 (15+18+15) 3= 16 30 8 9 9 (8+9+9) 3= 9 40 1 2 0 (1+2+0) 3= 1 ANALYSING EVIDENCE AND CONCLUDING ...read more.

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