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

Explanation

The autotrophs in the list given are: Nostoc Chara Porphyra Wolffia Autotrophs are organisms that can synthesize their own organic compounds using inorganic substances, such as carbon dioxide and sunlight or other forms of energy. They are capable of producing their own food through photosynthesis or chemosynthesis. The remaining organisms in the list are not autotrophs: Lactobacillus: Lactobacillus is a bacteria that is typically heterotrophic, meaning it obtains its energy from organic compounds produced by other organisms. Nitrosomonas and Nitrobacter: These are bacteria that are involved in the nitrogen cycle and are chemoautotrophs. They derive their energy from the oxidation of inorganic compounds, but they are not capable of photosynthesis. Streptomyces: Streptomyces is a genus of bacteria that is primarily decomposers and obtain their energy from breaking down organic matter. Saccharomyces: Saccharomyces is a yeast that is heterotrophic and obtains its energy from organic compounds. Trypanosoma: Trypanosoma is a parasitic protozoan that is heterotrophic and obtains its energy from consuming organic matter. Therefore, out of the organisms listed, four are autotrophs, and the remaining six are heterotrophs.