Day 60: CBSE Class 10 Science

5 questions (8 parts). Try each one first, then open its answer.

Question 1
Control and Coordination. This type asked 3 times: 2023, 2024, 2025. This one: 2025
8 $Observe the given figures A and B. When chhui-mui (sensitive) plant is touched, its leaves fold. This is due to :$
Tap an option to check your answer.
Question 2
Electricity. This type asked 3 times: 2023, 2024, 2025. This one: 2025
26 $How and why is an electric fuse used in an electric circuit ? Briefly describe its function.$
Question 3
Electricity. This type asked 3 times: 2023, 2024, 2025. This one: 2025
32 $2\,\Omega$
Question 4 (case study, 4 parts)
Heredity. This type asked 3 times: 2022, 2023, 2025. This one: 2025
In human beings, there are 23 pairs of chromosomes. Out of these 23 pairs of chromosomes (i.e. 46 chromosomes), 22 pairs of chromosomes are called autosomes and one pair of chromosomes. i.e. two chromosomes are called sex chromosomes. The sex chromosomes are of two types – ‘X’ chromosomes and ‘Y’ chromosomes. The sex of a child (i.e. progeny), is decided at the time of fertilisation. In other words, at the time of zygote formation the sex chromosomes inherited from the parents of a child decide whether the new born will be a boy or a girl.
38 (a) $What are chromosomes ?$
38 (b) $Why is the pair of sex chromosomes in human males called mismatched pair ?$
38 (c) (i) $Show with the help of a flow chart that the statistical probability of getting a boy or a girl is 50 : 50.$
38 (c) (ii) $Mention two examples of animals where sex is not determined genetically like human beings. Describe in brief the method of sex determination in these animals.$
Question 5
How do Organisms Reproduce?. This type asked 3 times: 2022, 2024, 2025. This one: 2025
Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
18 $Assertion (A) : The embryo gets nutrition from the mother’s blood with the help of a special tissue called placenta. Reason (R) : Placenta is a disc which is embedded in the uterine wall.$
Tap an option to check your answer.

Question 1

Question 2

Question 3

Question 4 (case study, 4 parts)

Question 5