Learning Corner

  What is a polymer? What is ester? Fill in: One of the oldest man-made material is ___________. _____________ is a naturally occurring polymer. ____________, a natural fiber is made of cellulose. __________ is a blended fibre. __________ is the first fully synthetic fibre. Rayon is obtained by chemical treatment of ___________. Nylon was first used to make ______________. The first synthetic fibre was prepared from __________, ____________ and ________. A synthetic fibre that resembles wool is ___________. _________ is a modern microfibre used to make sportswear. Full form of PVC is _________________. Full form of PET is _________________. __________ is used in fireproof suits. __________ is used in military uniforms. Inhalation of __________ can cause cancer. The process by which glass is cooled and made tougher is called __________. When PVC is burnt, it gives out ___________ gas. ____________ is a man made material inspired from nature. The material which is similar to silk in appe

  What are animalcules? Anton van   Leeuwenhoek, found tiny living things moving about in water    and named them as 'animalcules' which means 'tiny animals'. These animalcules are now known by the name microorganisms  List five diseases caused by virus.  Rabies Dengue Chicken Pox AIDS Hepatitis List five human diseases caused by bacteria.  Tuberculosis     Typhoid Cholera Pneumonia Sepsis of  wounds List five discoveries made by Anton van Leeuwenhoek.  Bacteria Protists Nematodes Sperm Cells Blood Cells What are nematodes? Give reasons: Viruses are borderline between living and non-living. Euglena is both a plant and an animal.  In colder parts of the world, summer vegetables are sun dried. After grinding the idli batter, it is left undisturbed for a minimum of 8-10 hours.   Mosquitoes can be controlled by preventing stagnation of water though they do not live in water  Atta can be stored longer than cooked chapatis Shoes, clothes get mold easily during rainy season Fa

What are animalcules? List five diseases caused by virus.  List five human diseases caused by bacteria.  List five discoveries made by Anton van Leeuwenhoek.  What are nematodes? Give reasons: Viruses are borderline between living and non-living. Euglena is both a plant and an animal.  In colder parts of the world, summer vegetables are sun dried. After grinding the idli batter, it is left undisturbed for a minimum of 8-10 hours.   Mosquitoes can be controlled by preventing stagnation of water though they do not live in water  Atta can be stored longer than cooked chapatis Shoes, clothes get mold easily during rainy season Farmers prefer to grow beans and peas in nitrogen deficient soils. Differentiate saprophytes and parasites. Differentiate pathogens and vectors with two examples. Differentiate gobar gas and biogas Differentiate rhizobium and rhizopus Differentiate natural and acquired immunity. Define pasteurisation. Write one similarity and distinguishing feature between Amoeba and

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