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CBSE Class 10 Science Solved Question Paper 2011

Short Answer Type

31.
Describe the role of fallopian tubes in the female reproductive system.

The fallopian tube is responsible for carrying the egg to the uterus. The finger-like processes or fimbriae of the tube reach out into the pelvic cavity and picks up the released egg. The fallopian tubes are not only crucial for the transport of the egg from the ovary to the uterus, they are also the location where the sperm meets the egg cell and fertilises the egg.

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32.

List any four disadvantages of using fossil fuels for the production of energy.

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33.

What does HIV stand for? Is AIDS an infectious disease? List any four modes of spreading AIDS.

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34.

Describe any three ways in which individuals with a particular trait may increase in population.

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35.

State the evidence we have for the origin of life from inanimate matter.

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36.

What are fossils? What do they tell us about the process of evolution?

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Long Answer Type

37.

a) State two properties of carbon which lead to a very large number of carbon compounds.
b) Why does micelle formation take place when soap is added to water? why are micelles not formed when soap is added to ethanol ?

Or

Explain isomerism. State any four characteristics of isomers. Draw the structure of possible isomers of butane C₄H₁₀.

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38.

a) What is meant by the 'power of a lens'?
b) State and define the S.I. unit of power of a lens.
c) A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with each other.
Calculate the lens power of this combination.

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