Jagranjos brings CBSE Class 10 Biology (Science) Practice Paper 2017-2018. This paper consists of all important questions of class 10 Biology which will help students prepare for the Periodic Tests, Half Yearly Exams as well as for the Board Examinations 2018. Questions asked in this practice paper will not only help students get an idea of the important topics to be prepared, but will also help them in understanding the depth with which these topics should be studied.
This year as per the CBSE’s remodeled assessment structure which has made the CBSE Class 10 Board exams mandatory, the assessment scheme will have an 80 marks component for class 10 Board examination in all scholastic subjects along with a 20 marks component of Internal Assessment (IA).
To do well in the changed exam structure students must have a good hold over the important topics and questions for which solving more and more practice papres is the best way.
Few sample questions from the Question Paper are given below:
Q. Where does the process of fertilisation take place in human females?
Q. List the two ways which can be used to check the contamination of river water.
Q. In case of the sexual reproduction the number of chromosomes in parents and their offspring is the same. Justify this statement.
Q. What is water harvesting? How can this technique help in the conservation of water?
Q. What is the importance of D.N.A replication in asexual reproduction? Why is variation beneficial to the species? Explain with suitable example.
Q. (a) What do you mean by ‘Evolution’? List the various sources which provide evidences for the evolution.
(b) Give the evidence that the birds have evolved from reptiles.
Q. (a) Name the respective part of the human female reproductive system:
(i) where fertilisation of egg takes place.
(ii) where development of embryo takes place.
(iii) which provides all the nourishment to the developing foetus.
(b) Describe in brief what happens to the zygote after it gets implanted.
Q. Teacher asked the students to study the different parts of an embryo of a gram seed. The steps likely to be followed are listed in a haphazard manner:
(i) Soak the gram seeds in plain water and keep them overnight.
(ii) Cut open the soaked seed and observe its different parts.
(iii) Take some dry gram seeds in a petri dish.
(iv) Drain the excess water.
(v) Cover the soaked seeds with a wet cotton cloth and leave them for a day.
The correct sequence of these steps is:
(a) iii, I, v, iv, ii
(b) iii, I, ii, iv, v
(c) iii. iv, v, i, ii
(d) iii, i, iv, v, ii
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