Photosynthesis Lab Report

Topics: Photosynthesis, Oxygen, Carbon dioxide Pages: 5 (1342 words) Published: October 5, 2012
Name: -------------------------------------------------
Biology 104
Lab Section: 14
TA: Victoria Prescott
Date: 9/13/2012

The Effects of Light Intensity and NaHCO3 concentrations on the Rate of Photosynthesis -------------------------------------------------

Definitions of terms:
The experiment conducted in class was to determine whether plants photosynthesize fastest under a room light or light from a 120 watt light bulb. This experiment was conducted because plants are the basis of the food chain and the key to life since they are able to convert the energy found in light waves into chemical energy that can be used by other organisms. The following terms were used in this experiment -------------------------------------------------

1- Photosynthesis: Photosynthesis is the process of converting light energy to chemical energy and storing it in the bonds of sugar. This process occurs in plants and some algae. Plants need only light energy, CO2, and H2O to make sugar. The process of photosynthesis takes place in the chloroplasts, specifically using chlorophyll, the green pigment involved in photosynthesis. -------------------------------------------------
2- Chloroplasts: are organelles found in plant cells and other eukaryotic organisms that conduct photosynthesis. Chloroplasts capture light energy, store it in the energy storage molecules ATP and NADPH and use it in the process called photosynthesis to make organic molecules and free oxygen from carbon dioxide and water. ------------------------------------------------- -------------------------------------------------

4- stoma, also called Stoma, plural Stomata, or Stomas,  any of the microscopic openings or pores in the epidermis of leaves and young stems. Stomates are generally more numerous on the underside of leaves. They provide for the exchange of gases between the outside air and the branched system of interconnecting air canals within the leaf. A stomate opens and closes in response to the internal pressure of two sausage-shaped guard cells that surround it. The inner wall of a guard cell is thicker than the outer wall. -------------------------------------------------

Hypothesis: Purpose of this experiment is to determine if the light a spinach plant is exposed to affects the rate of its photosynthesis. Hypothesis 1: I believe that the spinach leaves that are only exposed to room light will have a slower rate of photosynthesis, and the spinach plants that are exposed to incandescent light will photosynthesize faster. Hypothesis 2: I believe that an increase in the bicarbonate concentrations increases the rate at which CO2 is incorporated into carbohydrate in the light-independent reaction, and so the rate of photosynthesis generally increases until it’s limited by another factor -------------------------------------------------

Materials and methods:
Materials: Bicarbonate, Vacuum (Water aspirator), Large beaker, Spinach Leaves, Drinking straw (Hole puncher), Timer, Lamp (light...
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