Photosynthesis In Plants Essay

1108 words - 5 pages

Aim: To investigate the effect of different light intensities on the rate of photosynthesis (conventional method)Introduction: Photosynthesis is the main process by which plants produce food. There are a few conditions required for photosynthesis to take place. They are: Chlorophyll, Light, Carbon Dioxide and Water. Each of these factors has a different effect on the rate of photosynthesis. In plants, the chlorophyll present in the chloroplasts, converts the light energy from the sun and converts it into chemical energy. It also traps the sun's light energy. Hence, the light is obtained from the sun, but an artificial source, e.g.: light bulb can be used. When carbon dioxide and water react ...view middle of the document...

Record your observations in a table* Repeat the previous step and each time place the light source closer to the plant, e.g.: 40cm, 30cm, 20cm, 10 cm(Note that every time the light source is placed closer to the plant, the plant is exposed to a higher light intensity. Allow a few minutes for the plant to adapt to each new condition before taking readings)Observations:Distance between plant and lamp50 cm40 cm30 cm20 cm10 cmNumber of air bubbles in 5 minutes30205346359426Rate of bubbling (number of bubbles per minute)641697285The temperature of the solution in the test tube was constant at 81.5°F.The following graph shows the relationship between the Rate of Bubbling and Distance between lamp and plant:Questions:1. The process responsible for the formation of gas bubbles in the experiment is PHOTOSYNTHESIS.2. Light intensity has a major effect on photosynthesis. This is because it is one of the factors required for photosynthesis to take place. As the light source is brought closer to the test tube containing the plant, the number of bubbles increase and so does the rate of bubbling per minute.3. Sodium bicarbonate is added to the test tube instead of pure water so as to maintain a constant supply of carbon dioxide which helps in photosynthesis to take place.Conclusion: My hypothesis was proven right. I can conclude that as the light intensity increases, i.e. as the distance between the plant and the bulb increases, the rate of bubbling increases and the number of bubbles increase as well. It is direct proportion. This can be seen in both the table and the graph. The line of best fit moves directly uniformly upwards. As distance decreases, the rate of bubbling increases....

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