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

Explanation

Photoautotrophs are organisms that can synthesize their own food using sunlight as an energy source. In the list provided, the photoautotrophs are:Nostoc: A cyanobacterium capable of photosynthesis.Chara: A green alga that performs photosynthesis.Porphyra: A type of red alga known for photosynthesis.Wolffia: A type of aquatic plant that is photosynthetic.The other organisms in the list are not photoautotrophs:Lactobacillus: A heterotrophic bacterium.Nitrosomonas: A chemoautotrophic bacterium involved in the nitrogen cycle, relying on inorganic compounds for energy.Nitrobacter: Similar to Nitrosomonas, it is also chemoautotrophic.Streptomyces: A heterotrophic bacterium that decomposes organic matter.Saccharomyces: A heterotrophic yeast.Trypanosoma: A parasitic protozoan that is heterotrophic.Therefore, the correct answer is that four organisms are photoautotrophs, while the rest are not.