Question

Which of the following is the CORRECT combination of a synthetic auxin and a synthetic cytokinin?

• A. 2,4-Dichlorophenoxy acetic acid (2,4-D) and Indole-3-acetic acid (IAA)
• B. 2,4-Dichlorophenoxy acetic acid (2,4-D) and 6-Benzylamino purine (BAP)
• C. 6-Benzylamino purine (BAP) and Zeatin
• D. Indole-3-acetic acid (IAA) and Zeatin

Hint:

Auxin: IAA (natural), 2,4-D (synthetic). Cytokinin: Zeatin (natural), BAP (synthetic).

Answer 1

The Correct Option is B

Step 1: Recall synthetic hormones.
- Auxins: Natural auxin is Indole-3-acetic acid (IAA). A synthetic auxin is 2,4-D.
- Cytokinins: Natural cytokinin is Zeatin. A synthetic cytokinin is 6-Benzylamino purine (BAP).
Step 2: Evaluate options.
- (A) Wrong: IAA is natural, not synthetic.
- (B) Correct: 2,4-D (synthetic auxin) + BAP (synthetic cytokinin).
- (C) Wrong: Both BAP and Zeatin are cytokinins.
- (D) Wrong: Both IAA and Zeatin are natural hormones.
Step 3: Conclusion.
The correct combination is 2,4-D and BAP. Final Answer: \[ \boxed{\text{2,4-D (synthetic auxin) and BAP (synthetic cytokinin).}} \]