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

Step-by-step 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,