Problem 1: Identifying the Correct Hormone

Question: A plant is treated with a substance that:

• Causes internodal elongation in rosette cabbage
• Induces alpha-amylase in barley aleurone layer
• Breaks seed and bud dormancy
• Induces parthenocarpy in grapes

Which hormone is this?

Step-by-step Solution:

1. "Internodal elongation in rosette cabbage" → This is bolting → Gibberellin's signature effect
2. "Alpha-amylase in barley aleurone layer" → Confirmed: Gibberellin
3. "Breaks seed and bud dormancy" → Gibberellin (not cytokinin, which delays senescence)
4. "Parthenocarpy" → Both auxin and gibberellin can do this, but combined with all the above → Gibberellin

Answer: Gibberellin ($GA_{3}$)