Question

Match List-I with List-II. 

List-I (Activity)	List-II (Plant Direction)
(A) Phototropism	(I) Bend towards soil
(B) Geotropism	(II) Response to day length
(C) Thigmotropism	(III) Bending towards light
(D) Photoperiodism	(IV) Response to touch or movement

Choose the correct answer from the options given below.

• A. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
• B. (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
• C. (A)-(I), (B)-(II), (C)-(IV), (D)-(III)
• D. (A)-(III), (B)-(IV), (C)-(I), (D)-(II)

Hint:

Greek roots are helpful:
- Photo $\rightarrow$ Light
- Geo $\rightarrow$ Earth/Soil
- Thigmo $\rightarrow$ Touch
- Period $\rightarrow$ Day length

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Plants exhibit growth movements (tropisms) and developmental responses (periodisms) triggered by directional or seasonal environmental stimuli.

Step 2: Detailed Explanation:
Let us match the biological processes:
- (A) Phototropism matches with (III) Bending towards light: Curvature of plant shoots mediated by lateral auxin redistribution under directional light.
- (B) Geotropism (Gravitropism) matches with (I) Bend towards soil: Growth orientation of roots (positive) downward into the soil or shoots (negative) upward.
- (C) Thigmotropism matches with (IV) Response to touch or movement: Bending or coiling of tendrils upon physical contact with a support.
- (D) Photoperiodism matches with (II) Response to day length: Physiological response of plants to the relative lengths of day and night, regulating flowering.
The matching corresponds to: (A)-(III), (B)-(I), (C)-(IV), (D)-(II).

Step 3: Final Answer:
The matching matches Option (A).