Which organelle is known as the powerhouse of the cell?, Nucleus, Mitochondria, Ribosome, Cell wall, Which force opposes the motion of an object?, Gravitational force, Magnetic force, Frictional force, Muscular force, Which microorganism is used to make curd?, Virus, Lactobacillus, Amoeba, Yeast, What happens when a substance changes from liquid to gas?, Freezing, Condensation, Evaporation, Melting, Which of these is a renewable source of energy?, Coal, Petroleum, Solar energy, Natural gas

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