Question

Match List I with List II
List I:
A. F. W. Went
B. E. Kurosawa
C. F. Skoog
D. P. F. Waring
List II:
I. Abscisic acid
II. Cytokinins
III. Gibberellin
IV. Auxin
V. Ethylene
Choose the correct answer from the options given below:

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

Hint:

To remember hormone discoveries: 1. Went $\to$ Auxin (Avena curvature test). 2. Kurosawa $\to$ Gibberellin (Bakanae/foolish seedling disease of rice). 3. Skoog $\to$ Cytokinins (tobacco pith tissue cultures). 4. Waring $\to$ Abscisic acid (leaf dormancy studies).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Plant hormones (phytohormones) are signal molecules produced at low concentrations that regulate all aspects of plant growth, development, and environmental responses.
Each class of phytohormones was discovered through pioneering experiments by different scientists.

Step 2: Detailed Explanation:
Let us match the scientists in List I with their discoveries in List II:
A. F. W. Went: In 1928, Went isolated a growth-promoting chemical from oat (Avena sativa) coleoptile tips using agar blocks, which he named Auxin (specifically indole-3-acetic acid). Thus, A matches with IV.
B. E. Kurosawa: In 1926, Kurosawa discovered that sterile filtrates of the fungus Gibberella fujikuroi caused extreme elongation in rice seedlings (the "foolish seedling" or Bakanae disease), leading to the discovery of Gibberellins. Thus, B matches with III.
C. F. Skoog: In the 1950s, Skoog and his co-workers discovered that autoclaved herring sperm DNA strongly promoted cell division in tobacco pith cultures. This led to the isolation of kinetin, the first identified Cytokinin. Thus, C matches with II.
D. P. F. Waring: In 1963, Waring isolated a growth-inhibiting substance from deciduous tree leaves undergoing dormancy, which he named "dormin," later identified as Abscisic acid (ABA). Thus, D matches with I.
This matching results in the sequence: A - IV, B - III, C - II, D - I.

Step 3: Final Answer:
The matching pairs correspond to option (A).