Question

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The Effects of Varying Wavelengths (nm) on the Absorbtion of Photosynthetic Pigments (Au) 1.2 1 0.8 0.6 0.4 Absorbance of Photosynthesis Pigments (Au) 0.2 380 400 410 420 430 440 450 460 470 480 500 520 560 600 620 630 640 650 660 670 680 700 -0.2 -04 Wavelength (nm) -Chlorophyll A -Chlorophyll B -Carotenes & Xanthophylls -Pigment Mixture 1. What does your graph tell you about the absorbance of the different spectra? 2. Based on the spectra, make a hypothesis about the effect of light intensity on the rate of production of sugars and the growth rate of plants.

Answer 1

1. The graph is showing the absorbance of light at different wavelength by 3 different pigments. The absorbance is higher at blue and red region of spectrum for 3 pigments. The pigment mixture is not showing any absorbance on whole visible spectrum.

2. Light intensity means the amount of light. If the intensity of light is increased then rate of photosynthesis increases so the production rate of sugars increases and there will be growth of plant.

3. Blue or red color lights should installed as pigments absorption rate for the light is higher in these colors.

4. Blue and red color should be choosen . If these two colors will be provided then the absorption of light would be maximum . So the plant growth will be maximum .