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
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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
Farmers use jute bags, metallic bins, silos, and granaries for storage. Neem leaves are used at home, while large godowns may require specific chemical treatments. NCERT Class 8 Science Chapter 1 Crop Production and Management
Drying harvested grains reduces moisture, preventing spoilage and attacks by insects, bacteria, and fungi, ensuring the grains remain fit for use and germination. NCERT Class 8 Science Chapter 1 Crop Production and Management
Weedicides may affect the health of the person handling the sprayer. Precautions include covering the nose and mouth with a cloth during spraying to minimize health risks. NCERT Class 8 Science Chapter 1 Crop Production and management
Harvesting is done manually by sickle or by a machine called a harvester. The sickle is commonly used for manual harvesting. NCERT Class 8 Science Chapter 1 Crop Production and Management
The cutting of a mature crop is called harvesting. A cereal crop usually takes 3 to 4 months to mature. NCERT Class 8 Science Chapter 1 Crop Production and Management
Weedicides are chemicals, like 2,4-D, used to control weeds. They are diluted with water and sprayed in fields during the vegetative growth of weeds, ensuring minimal impact on crops. NCERT Class 8 Science Chapter 1 Crop Production and Management