Question

Which plant hormone is mainly responsible for fruit ripening?

• A. Auxin
• B. Cytokinin
• C. Ethylene
• D. Gibberellin

Hint:

One "bad apple" really does spoil the bunch! A ripening fruit releases ethylene gas, which triggers the neighboring fruits to ripen faster as well. This is why putting a green banana in a paper bag with a ripe apple speeds up the ripening process.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Plant hormones (phytohormones) are signal molecules produced within plants that occur in extremely low concentrations. They control all aspects of growth and development, from embryogenesis to the regulation of organ size and pathogen defense.

Step 2: Detailed Explanation:
Ethylene is unique among plant hormones because it is a gaseous hormone. It is primarily known as the "ripening hormone" because it stimulates the conversion of starch and acids into sugars, softening the fruit and changing its color.
• Auxin: Responsible for cell elongation and apical dominance.
• Cytokinin: Promotes cell division and delays senescence (aging).
• Gibberellin: Promotes stem elongation and seed germination.

Step 3: Final Answer:
Ethylene is the hormone responsible for fruit ripening.