Biology 2601A/B Lecture : organismal phys

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Co2 is high in winter due to less photosynthesis. Photosynthesis is the most important biological process on earth. 165 billion tonnes of carbon is taken from the air and put into plants each year. There is no carbon cost for having plants. Light is a particle and a wave and contains energy. Short wavelength (high frequency) light has high energy content. Chlorophyll is a type of pigment that absorbs red and blue light. The wavelengths on the absorption spectra reflect the colour of light absorbed. Absorption of the photon increases the energy level of the molecule. The absorption spectrum of a leaf and the plot of the relative rate of photosynthesis are the same or equal when the pigment used to obtain the absorption spectrum is the same as that which causes the response (photosynthesis). The epidermis of the leaf reflects light and transfers it to the chloroplast.

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