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

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

Correct answer: Five

Solution

Nostoc, Chara, Nitrosomonas, Nitrobacter, and Porphyra are autotrophs. The others are heterotrophs, so the total number of autotrophs is five.

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