Solved papers for 10th Class Science Solved Paper - Science-2017 Delhi Set-III

1) Write the molecular formula of first two members of homologous series having functional group - OH.

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2) How does Plasmodium reproduce? Is this method sexual or asexual?

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3) Why is lake considered to be a natural ecosystem?

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4) How do advantages of exploiting natural resources with short term gains in mind differs from the advantages of managing our resources with a long term perspective?

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5) What is meant by wildlife? How is it important for us?

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Complete the following chemical equations:

(i) \[{{C}_{2}}{{H}_{5}}OH+{{O}_{2}}\to \]

(ii) \[{{C}_{2}}{{H}_{5}}OH+{{O}_{2}}\xrightarrow[443K]{Conc.{{H}_{2}}S{{O}_{4}}}\]

(iii) \[C{{H}_{3}}COOH\mathrm{ }+\mathrm{ }NaHC{{O}_{3}}\to \]

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7) The molecular formula of two carbon compounds are \[{{\mathbf{C}}_{\mathbf{4}}}{{\mathbf{H}}_{\mathbf{8}}}\] and \[{{\mathbf{C}}_{\mathbf{3}}}{{\mathbf{H}}_{\mathbf{8}}}\]. Which one of the two is most likely to show addition reaction? Justify your Ans. Also give the chemical equation to explain the process of addition reaction in this case.

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8) List any four steps involved in sexual reproduction and write its two advantages?

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9) Write about power of accommodation of human eye. Explain why the image distance in the eye does not change when we change the distance of an object from the eye?

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