A. Auxin
A.
B. Cytokinin
B.
C. Gibberellin
C.
D. Ethylene
D.
Correct Answer: D
সঠিক উত্তর: D
Explanation
ব্যাখ্যা
Ethylene is a gaseous plant hormone that naturally triggers the ripening process in fruits, causing them to soften, change colour, and develop their characteristic flavour.