Question

Match the plant hormones given in Column I with the scientists who isolated them given in Column II.

Column- I	Column- II
A) Auxin	I) Yabuta and Sumiki
B) Gibberellin	II) Denny, Gane and Crocker
C) Cytokinin	III) Kogl and Smit
D) Ethylene	IV) Skoog and Miller

Choose the correct option.

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

Hint:

Recall which scientists first isolated each plant hormone from its source.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
Each plant growth regulator was first isolated by a particular group of scientists. The question asks us to pair the four hormones with those names.

Step 2: Match the hormones
Auxin was isolated by Kogl and Smit, so A pairs with III.
Gibberellin was isolated by Yabuta and Sumiki from the fungus Gibberella, so B pairs with I.
Cytokinin (kinetin) was obtained by Skoog and Miller, so C pairs with IV.
Ethylene is linked with Denny, Gane and Crocker, so D pairs with II.

Step 3: Compare the options
Only the first option has A - III, B - I, C - IV and D - II together.

Final Answer:
The correct matching is A - III, B - I, C - IV, D - II. \[ \boxed{\text{(A) }\text{A - III, B - I, C - IV, D - II}} \]