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1.Define diffusion and osmosis 2.why plasma membrane is known as semipermeable membrane 3.what is cell division 4.name two organnels which have own DNA and protons 5.Define acute and chronic disease 6.define the vaccination 7.what is atom 8.define one mole 9.draw the labelled diagram of parenchyma,collenchyma and sclerenchyma 10.differentiate between electron ,proton and neutron 11.explain universal law of gravitation 12.prove:F=G×m1×m2/r^2 13.what is distillation 14.prove kinetic energy 15.differentiate between distance and displacement 16.differentiate between mass and weight 17.define balanced and unbalanced force 18.what is energy 19.what is acid rain 20.define nervous tissue 21.what is global warming 22.define law of constant proportion 23.what was Dalton atomic theory 24.prove law of conservation of mass 25.by which process we can separate two immiscible liquid 26.define colloidal solution 27.difference between mixture and compound 28.plasma membrane made up of which things 29.cell wall made up of which things 30.give characteristics of bone 31.what is voluntary muscles 32.explain free fall 33.what is buoyant force 34.define infectious diseases 35.who discovered the vaccination and how 36.how ozone layer useful for human beings 37.define third law of motion 38.what is inertia 39.define effect of force 40.differentiate xylem and phloem

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