Question

Which of the following plant hormones is primarily responsible for apical dominance?

• A. Cytokinin
• B. Auxin
• C. Ethylene
• D. Abscisic acid

Hint:

To remember this, think: Auxin = Apical. It's all about the "A" level growth!

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Apical dominance is a phenomenon where the central stem of a plant grows more strongly than the side (lateral) stems. This is controlled by chemical messengers called hormones.

Step 2: Key Formula or Approach:
The primary hormone produced in the shoot tip (apex) is Auxin.

Step 3: Detailed Explanation:
Auxin is synthesized at the tip of the stem. It moves downward and inhibits the growth of lateral buds. This ensures the plant grows vertically toward light. If the tip is removed, the source of auxin is gone, allowing lateral buds to grow, which makes the plant "bushy."

Step 4: Final Answer:
The hormone primarily responsible for apical dominance is Auxin.