Light Intensity On Egeria Densa's Leaves Photosynthesis

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IB biology higher level

Internal Assignment
Investigation of the effects of light intensity on Egeria Densa’s leaves photosynthesis in the observation on leaf

Student name: Eren Kuriyama Date: January

Title:
Investigation of the effects of light intensity on Egeria Densa’s leaves photosynthesis in the observation on leaf

Background information:

When sun lights are taken by pigments in the leaf which is chlorophyll a and b, electrons in photosystems are pushing up to high energy level. The leaves producing ATP, to reduce NADP to NADPH, and integrate CO2 to non-chemical molecular during process called carbon fixation. When Egeria Densa leaves are kept in water and through the process of the light dependent reaction, that oxygen is gave and resolved to the inner part of the leaf that causes them to rising up. Also cellular …show more content…

3. Put one branch of Egeria Densa in the test tube a and b.
Test tube c is without Egeria Densa plant.
Important: All branches of Egeria Densa should prepare from same Egeria Densa plant.

4. Put the car by human respiration. What we exhausting is carbon dioxide. So in the test tubes a, b, c put carbon dioxide. The length of exhausting carbon dioxide should be 15 seconds that measured by stopwatch.

5. Put a rubber caps on the top of test tubes to seal inside. Important: Quickly as possible to seal up all test tubes as same time as finished putting carbon dioxide. At this time the color of solution changes into green, which is neutural.

6. Check the room temperature and if it is too cold or too hot, use air condition to adjust around 20 to 25℃.

7. Put test tubes a and c under the electric heater.

8. Covering test tube b with aluminum foil to avoid from sunlight or electric heater.

9. Keep this condition for 3

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