Q1.Why Always acid is added into water not water into acid ?
Q2.Why should sour substances not to be kept in brass and copper vessels ?
Q3.Why baking soda is always added in milk in summer season ?
Q4.Why arteries have thicker walls then veins ?
Q5.Write the role of Valves ?
Q6.On rubbing a tarnished copper vessel with a lemon, it begins to shine.Why ?
Q7.Write two uses of a substance “X” which is also named as Calcium sulphate hemihydrate.
Q8.What are gustatory receptors ?
Q9.Define reflex action.
Q10.Give two diiferences between voluntary and involuntary actions.
Q11.Define geotropism.
Q12.Why iodised salt is advisable ?
Q13.Write the role of medulla oblongota. Q14.How do auxins promote growth of plant ?
Q14.Write two causes of Myopia.
Q15.Define Power of Accomodation. Q16.What is far point of normal eye ?
Q17.What is spectrum ?
Q18.Define Self Pollination.
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