CBSE Class 10 Sample Paper Science Solution - For 2024 Boards

Question 1

Question 2 Important

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Question 17 [Assertion Reasoning] Important

Question 18 [Assertion Reasoning]

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Question 22 Important

Question 23 (Choice 1) Important

Question 23 (Choice 2)

Question 24

Question 25 (Choice 1)

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Question 28 (Choice 1) Important

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Question 29 Important

Question 30 You are here

Question 31 (i) Important

Question 31 (ii)

Question 31 (iii) Important

Question 32 (i)

Question 32 (ii) Important

Question 33 Important

Question 34 (Choice 1A)

Question 34 (Choice 1B) Important

Question 34 (Choice 2)

Question 35 (Choice 1)

Question 35 (Choice 2A) Important

Question 35 (Choice 2B)

Question 36 (Choice 1) Important

Question 36 (Choice 2) Important

Question 37 (a) [Case Based]

Question 37 (b) - Choice 1 [Case Based] Important

Question 37 (b) - Choice 2 [Case Based]

Question 38 (a) [Case Based] Important

Question 38 (b) [Case Based]

Question 38 (c) - Choice 1 [Case Based] Important

Question 38 (c) - Choice 2 [Case Based]

Question 39 (a) [Case Based]

Question 39 (b) [Case Based] Important

Question 39 (c) - Choice 1 [Case Based]

Question 39 (c) - Choice 2 [Case Based] Important

What is the probability of a girl or a boy being born in a family? Justify your answer.

 

Answer:

There are two types of chromosomes present in a human, 22 autosomes and a pair sex chromosomes. Females have XX sex chromosome whereas males have an XY chromosome. 

An infant receives one chromosome from both the parents. The sex of the infant is decided by the chromosome carried by the father (male gamete). This is because the infant will always receive an X chromosome from the mother (female gamete). If the male gamete carries X chromosome, it will be a daughter and if it carries a Y chromosome, it will be a son. 

Therefore, there is 50% chance of an infant being a girl and 50% chance of it being a boy. 

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo