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The chlamydomonas has the eye spot which are red colour and photosensitive spot. It helps the algae to move towards the moderate intensity of light which is an ideal condition for the normal metabolism. The chlamydomonas shows autotrophic mode of nutrition. The algae can synthesize the organic food materials by photosynthesis with the help of chloroplast. So the chlamydomonas is considered as photoautotrophs.