Viruses reproduce only inside host cells (bacteria, plants, or animals). Common ailments like cold, flu, cough, and serious diseases like polio and chickenpox are caused by viruses. NCERT Class 8 Science Chapter 2 Microorganisms: Friend and Foe

Microorganisms are classified into bacteria, fungi, protozoa, and some algae. NCERT Class 8 Science Chapter 2 Microorganisms: Friend and Foe

Microorganisms are tiny living organisms not visible to the naked eye. They are called microbes because of their small size. NCERT Class 8 Science Chapter 2 Microorganisms: Friend and Foe

Freshly harvested grains with more moisture are prone to spoilage and attacks by organisms, rendering them unfit for use or germination. NCERT Class 8 Science Chapter 1 Crop Production and Management