1(iii)
Assertion (A): Plants do not have sense organs but still respond to different stimuli.
Reason (R): Plants have a well-developed hormonal system to respond to sunlight, gravity, water, etc.
- (a)(A) is true and (R) is false.
- (b)(A) is false and (R) is true.
- (c)Both (A) and (R) are true and (R) is the correct explanation of (A).
- (d)Both (A) and (R) are true, but (R) is not the correct explanation of (A).
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Both (A) and (R) are true and (R) is the correct explanation of (A).
Reason — Plants have neither sense organs nor a nervous system, yet they respond to stimuli such as light, gravity and water. These responses are brought about by phytohormones like auxins. Hence the hormonal system correctly explains why plants are able to respond to stimuli.