Index
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IMPORTANT QUESTIONS

  1. Q411 Name the mode of nutrition in Amoeba.
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  2. Q412 "Energy flow in a food chain is unidirectional." Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.
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  3. Q413 Write balanced chemical equations for the following reactions : dilute sulphuric acid reacts with aluminium powder.
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  4. Q414 Balance the following chemical equations and state whether they are exothermic or endothermic: FeSO₄ --------→ Fe₂O₃ + SO₂ + SO₃
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  5. Q415 A farmer is growing a crop regularly in his field. He uses chemical fertilizers, pesticides, organic manure as well as bio-fertilizers. Very close to his field is a factory which emits smoke as a byproduct. There is also a huge lake in the nearby area. (b) Consider the following food chain in the same lake. Aquatic plant → Small fish → Big fish → Birds Which of the above organisms is likely to show minimum amount of pesticide concentration in them after considerable time? (i) Aquatic plants (ii) Small fish (iii) Big fish (iv) Birds
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  6. Q416 Mention the range of pH of acidic solution, basic solution and neutral solution respectively.
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  7. Q417 Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in open. Suggest one method to prevent it.
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  8. Q418 Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of
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  9. Q419 Write the next homologue of C₄H₆.
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  10. Q420 Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table?
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