Science · World of living · chapter 8 of 13

Class 10 Science Chapter 8: Heredity Assertion-reason questions with answers

2 assertion-reason questions on Heredity, each with its answer and the reason, written from the NCERT chapter. Open a question's solution to check your working; then take the free test to find your next chapter. Each question gives an Assertion (A) and a Reason (R); choose how they stand to each other.

Question 1
Assertion (A): Four bacteria formed when one bacterium divides twice are very similar, but not exactly identical. Reason (R): Small inaccuracies in DNA copying create very minor differences at each division.
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Answer: (a) Both A and R are true, and R is the correct explanation of A.

Both are true, and the copying errors in R are exactly what makes the four cells slightly different.

Question 2
Assertion (A): Mendel was able to arrive at the laws of inheritance from his crosses of garden peas. Reason (R): Mendel worked with contrasting visible characters such as tall or short plants.
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Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Both are true, but many before Mendel had studied peas. What let him reach the laws was that he was the first to count the individuals showing each trait in every generation, so R does not explain A.

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