How many organisms in the list given below are photoautotrophs?
(Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Saccharomyces, Trypanosoma, Porphyra, Wolffia)

Four

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Five

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Six

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Three

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Solution

The correct option is A Four
Autotrophs are those organisms which are able to make energy-containing organic molecules from inorganic raw material by using basic sunlight.
Nostoc, Chara, Porphyra and Wolffia are photoautotrophs while Nitrosomonas and Nitrobacter are chemoautotrophs.
So, (C) is the correct answer.

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Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Wolfia

N_{2}

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