Science · World of living · chapter 6 of 13

Class 10 Science Chapter 6: Control and Coordination Assertion-reason questions with answers

2 assertion-reason questions on Control and Coordination, 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): Most multicellular organisms use chemical communication between cells in addition to electrical impulses. Reason (R): A cell that has generated and transmitted an electrical impulse needs time to reset before it can send another.
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Answer: (a) Both A and R are true, and R is the correct explanation of A.

Both are true. Because cells cannot continually create and transmit impulses, most multicellular organisms also use chemical communication, so R explains A.

Question 2
Assertion (A): Gibberellins help in the growth of the stem. Reason (R): Cytokinins are present in greater concentration in fruits and seeds.
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Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Both statements are true, but the concentration of cytokinins in fruits and seeds says nothing about why gibberellins help stem growth.

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