Because plants contain the green pigment chlorophyll, they have the ability to trap sunlight. Plants can use the energy of sunlight to power the process of photosynthesis. Photosynthesis occurs inside of cellular structures called chloroplasts.
During photosynthesis, light energy captured in chlorophyll powers a complex, multi-stage chemical reaction in which carbon, hydrogen, and oxygen atoms are assembled into glucose and oxygen gas. The reaction occurs in two major steps: the light reaction and the dark reaction. The light reaction requires the presence of light, and it is during this phase of photosynthesis that oxygen is generated. The dark reaction, which can proceed without light, is the stage in which glucose molecules are assembled.
|Data table: Rate and volume of gas bubbles|
|Wattage of lightbulbs||A
Rate at which bubbles were generated (no. of bubbles/minute)
Number of milliliters that water volume changed in graduated cylinder
|First 5 minutes; no lightbulb|