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  4. How many organisms in the list given below are autotrophs? (Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Saccharomyces, Trypanosoma, Porphyra, Laminaria)

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Q. How many organisms in the list given below are autotrophs?
(Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Saccharomyces, Trypanosoma, Porphyra, Laminaria)

NTA AbhyasNTA Abhyas 2022

Solution:

Autotrophic organisms are those organisms that are capable of synthesizing food themselves from inorganic and organic substances. Autotrophs can be of two types: photoautotrophs and chemoautotrophs. In photoautotrophic organisms, there is chlorophyll present due to which they can prepare their food through carbon dioxide and water in the presence of sunlight whereas chemoautotrophs obtain energy through food by chemical source instead of light. Out of the given examples, photoautotrophs are Nostoc, Chara, Porphyra, and Laminaria. Chemoautotrophs are Nitrosomonas and Nitrobacter are chemoautotrophs. Parasitic organisms are Trypanosoma, and heterotrophic organisms are Lactobacillus, Streptomyces.