1(xiv)
Sunil tried to match the tropic movements in plants with the stimulus they respond to. The tabulation is given below:
| Tropism | Stimulus | |
|---|---|---|
| P | Thigmotropism | Touch |
| Q | Geotropism | Water |
| R | Chemotropism | Chemicals |
| S | Phototropism | Gravity |
Identify the correct pair:
- (a)P and R
- (b)Q and S
- (c)R and S
- (d)P and S
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P and R
Reason — Thigmotropism (P) is the response to touch.
Chemotropism (R) is the response to chemicals.
Geotropism (Q) responds to gravity, not water.
Phototropism (S) responds to light, not gravity.