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Question 4:, Can microorganisms be seen with the naked eye? If not, how can they, , be seen?, Answer:, , Micro-organisms are too small to be seen through naked eyes. They can, , be seen with the help of a magnifying glass or microscope., , For example, fungus that grows on bread is so small that it can be seen, , only with the help of a magnifying glass or microscope., , Exercise Page No 30:, , Question 5:, , What are the major groups of microorganisms?, Answer:, , There are five major groups of microorganisms:, , (i) Bacteria - They are single celled disease-causing microorganisms., They can be spiral or rod- shaped., , (ii) Fungi - They are mostly multicellular disease-causing microbes., , Bread moulds are common examples of fungi., , (iii) Protozoa - They mainly include organisms such as Amoeba,, , Plasmodium,etc. They can be unicellular or multicellular., , (iv) Algae - They include multicellular, photosynthetic organisms such as, , Spirogyra, Chlamydomonas, etc., , (v) Virus - Viruses are disease-causing microbes that reproduce only, , inside the host organism.