CBSE Class 10 Science Solved Question Paper 2014

Find CBSE Class 10 Science Solved Question Paper 2014. These questions not only helps the students to prepare for exams in a better manner, but also helps them in understanding the depth with which a topic should be studied.

Few Sample Questions from the Question Paper are given below:

Q. No two individuals are absolutely alike in a population. Why?

Ans. No two individuals are absolutely alike in a population due to variations taking place during the process of DNA copying.

Q. Write one negative effect of affluent lifestyle of few persons on the environment.

Ans. Affluent lifestyle of few persons leads to exploitation and overconsumption of natural resources which ultimately results in their scarcity.

Q. "A concave mirror of focal length 15 cm can form a magnified, erect as well as inverted image of an object placed in front of it." Justify this statement stating the position of the object with respect to the pole of the mirror in both the cases  for obtaining the images.

Ans. For magnified and erect image the object is placed between pole P and focus F. For magnified and inverted image the object is placed either at focus or anywhere between F and C.

Q. "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.

Ans. The flow of energy in the ecosystem is said to be unidirectional because the energy lost as heat from the living organisms of a food chain cannot be reused by plants in photosynthesis.
Pesticides are non-biodegradable wastes which pass along the food chain from crops to man or other animals and birds and harm them.

Q. Write one difference between asexual and sexual mode of reproduction. Which species is likely to have better chances of survival - the one reproducing asexually or the one reproducing sexually? Justify your answer.

Ans. The difference between asexual and sexual reproduction is that only one parent is needed in asexual reproduction whereas two parents are needed in sexual reproduction. The organisms reproducing sexually have better chances of survival because it promotes diversity of characters in an offspring due to combinations of genes which can lead to variation whereas in asexual reproduction evolutionary change is not possible as only one parent is involved therefore no variation takes place.