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How many organisms in the list given below are autotrophs? Lactobacillus, Nostoc, Chara, Nitrosomonas Nitrobacter, Streptomyces, Sacharomyces Trypanosoma, Porphyra, Wolfia

1. Five
2. Six
3. Three
4. Four

Correct answer: Four

Solution

Autotrophs include photosynthetic organisms and chemoautotrophs. In the list, Nostoc, Chara, Nitrosomonas, and Nitrobacter are autotrophs, while the others are heterotrophs or parasites.

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