The rate of photosynthesis may vary with changes that occur in environmental tem
ID: 178988 • Letter: T
Question
The rate of photosynthesis may vary with changes that occur in environmental temperature, wavelength of light, and light intensity. Using a photosynthetic organism of your choice, choose only ONE of the three variables (temperature, wavelength of light, or light intensity) and for this variable design a scientific experiment to determine the effect of the variable on the rate of photosynthesis for the organism; explain how you would measure the rate of photosynthesis in your experiment; describe the results you would expect. Explain why you would expect these results.Explanation / Answer
Aim: To determine the effect of wavelength (colors) of light on the rate of photosynthesis.
Experimental set up: Elodea canadensis (pondweed) will be used in this experiment. The rate of photosynthesis will be measured by counting the oxygen bubbles per minute given off by elodea. Elodea would be placed in a beaker with sodium bicarbonate. The wavelength (color) of light will be varied using colored filters and the number of oxygen bubbles given off will be counted.
Expected results: Blue light will result in the highest rate of photosynthesis due to the fact that it has a short wavelength and therefore has higher energy. Green light will result in the lowest rate of photosynthesis. Although green light has a shorter wavelength yet most of the energy energy will be reflected and not absorbed. Yellow and orange will have average photosynthetic rates. Red will have a very high photosynthetic rate
due to high rate of absorption.
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