Question

For question number 18,19 and 20, two statements are given- one labelled Assertion(A)
and the other labelled Reason(R). Select the correct answer to these questions 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.
18. Assertion: Spherical mirror is having single foci but lens is having two focus. 1
Reason: Spherical mirror is having one spherical surface but lens is having two surfaces.
19. Assertion: When zinc is added to a solution of iron (ll) sulphate, no change is observed.
Reason: Zinc is less reactive than iron. 1
20. Assertion: Plants raised by vegetative propagation can bear flower and seed earlier
than those produced from seeds. 1
Reason: Plants which lost capacity to bear viable seeds, can propagate through
vegetative propagation.

Answer 1

Answer:

B is the right option for 1st question

c) is right option

20. is true as the reproduction happens when the plant is obtained from a seed only