In this article, we are providing you the CBSE Class 10 Science Solved Question Paper 2018. All the solutions are explained in the most appropriate manner so as to help students easily understand the concepts involved and write perfect answers in board exams.
CBSE Class 10 Science Solved Question Paper 2018 is available in the form of PDF which students may download to practice for the CBSE class 10 board exams 2019.
Some of the questions and their solutions from the CBSE Class 10 Science Solved Question Paper 2018, are given below:
Q. A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1 progeny ?
Ans. Violet flowers
Q.Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.
Ans. Any one of the following difference:
(i) In sexual reproduction two opposite sexes are involved where as in asexual reproduction only one individual is involved.
(ii) In sexual reproduction male and female gamete formation takes place where as in asexual no gamete formation occurs.
Q. Students in a school listened to the news read in the morning assembly that the mountain of garbage in Delhi, suddenly exploded and various vehicles got buried under it. Several people were also injured and there was traffic jam all around. In the brain storming session the teacher also discussed this issue and asked the students to find out a solution to the problem of garbage. Finally they arrived at two main points – one is self management of the garbage we produce and the second is to generate less garbage at individual level.
(a) Suggest two measures to manage the garbage we produce.
(b) As an individual, what can we do to generate the least garbage? Give two points.
(c) List two values the teacher instilled in his students in this episode.
(a) A few good measures to manage the garbage we produce include: Incineration, waste compaction, biogas generation, composting, segregation, vermicomposting and safe disposal. (write any two)
(b) Some activities that need to be incorporated to generate the least garbage include:
(c) Awareness about environment, scientific attitude, concern for community health and personal health.
Q. List the steps of preparation of temporary mount of a leaf peel to observe stomata.
Ans. The steps are:
i. Removal of peel from leaf.
ii. Stain with safranin.
iii. Put the stained peel on a clean slide.
iv. Mount it with glycerine and cover slip.
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