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

### done Solved Paper - Science-2017 Delhi Set-III

• question_answer1) Write the molecular formula of first two members of homologous series having functional group - OH.

• question_answer2) How does Plasmodium reproduce? Is this method sexual or asexual?

• question_answer3) Why is lake considered to be a natural ecosystem?

• question_answer4) 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?

• question_answer5) What is meant by wildlife? How is it important for us?

 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) $C{{H}_{3}}COOH\mathrm{ }+\mathrm{ }NaHC{{O}_{3}}\to$

• question_answer7) 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.

• question_answer8) List any four steps involved in sexual reproduction and write its two advantages?

• question_answer9) 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?