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Question

How many are autotrophs : Lactobacillus, Nostoc, Chara, Nitrosomonas, Streptomyces, Saccharomyces, Trypanosoma, Porphyra, Wolffia?

A
Four
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B
Five
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C
Six
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D
Three
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Solution

The correct option is B Five
Autotrophs are the organism that can manufacture their own food using materials from inorganic sources. These are also known as the producers and they are divided into two categories; the photoautotrophs and chemoautotrophs. Few examples are plants, green algae that includes the cyanobacteria and all the archaebacteria.
From the given options the organisms that are not autotrophic are Nitrosomonas, Trypanosoma, Porphyra, Streptomuces and Saccharomyces.
So, the correct option is 'Five'

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