CBSE Class 10 Science Solved Paper 2020
Science is one of the subjects that class 10 students really love when it comes to learning, but equally fear as an exam. Thus, as CBSE conducted the class 10 science paper today on March 4, 2020, lakhs of students across the nation had to push back their fear, awaken the Einstein and Marie Curie within them, and face the science board exam 2020.
With the exam over now, Sarthaks .econnect brings to you the solved papers of the same. You will find here the CBSE Class 10 Science Solved Paper 2020 Set 1 Code 31/1/1 and in case you do not find the answers you are looking for, please drop a comment below and we will try our best to provide you with what you seek.
Here solution of some questions of science class 10 are given
Q1. The growing size of the human population is a cause of concern for all people. The rate of birth and death in a population will determine its size. reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing to control the size of population.
(a) List two common signs of sexual maturation in boys and girls.
(b) What is the results of reckless female foeticide?
(c) Which contraceptive method changes the hormonal balance of the body?
(d) Write two factors that determine the size of a population
a) (i) Pubic hair appears.
(ii) Hairs under armpits.
b) A low supply of women results in men and their families trafficking women from other areas and leads to increased sexual violence and abuse against women and children, increased child marriages, and increased maternal deaths due to forced abortions and early marriages.
c) Hormonal Contraceptive Methods.
d) The rate of birth and death determine the size of population.
Q2. Two statements are given- one labelled Assertion
(A) and the other labelled Reason (R). Select the correct answer to these question from the codes(a), (b), (c) and (d) as given below:
(a) Both A and R are true and R is correct explanation of the Assertion.
(b) Both A and R are true but R is not the correct explanation of the Assertion.
(c) A is true but R is false.
(d) A is false but R is true.
Assertion(A): Esterification is a process in which a sweet smelling substance is produced.
Reason (R): When esters react with sodium hydroxide an alcohol and sodium salt of carboxylic acid are obtained.
The correct option is (b) Both A and R are true but R is not the correct explanation of the Assertion.
When alcohol is added to carboxylic acid with sodium hydroxide and heated in bath tub, it produces a sweet smell of ester and this process is called Esterification.