Which of the following molecules acts to hasten fruit ripening?

Question

BlackTom AI · Accepted Answer

Let's break down the options and evaluate their roles in plants, specifically regarding fruit ripening.
Option 1: auxin. Auxins are mainly involved in cell elongation, apical dominance, and root development. While they influence various growth processes, they are not the primary accelerating signal for fruit ripening. In many cases, high auxin levels can delay overripening, so this choice does not fit the question.
Option 2: gibberellic acid. Gibberellins promote stem elongation, seed germination, and other growth responses. They are not the key hormone that hastens fruit ripening; in some contexts they can even delay or modify ripening, making this an incorrect fit for accelerating ripening specifically.
Option 3: cytokinin. Cytokinins primarily stimulate cell division and shoot development, and they influence nutrient mobilization and delay senescence in some tissues. They are not the hormone responsible for speeding up the ripening process in fruit, so this option is not correct for the stated effect.
Option 4: abscisic acid. Abscisic acid (ABA) is largely associated with stress responses and the induction of dormancy, as well as the inhibition of growth and delayed ripening in certain contexts. It generally acts opposite to ripening acceleration, so this choice does not describe a molecule that hastens ripening.
Option 5: ethylene. Ethylene is the well-known gaseous plant hormone that acts as the primary ripening agent for many fruits. It promotes softening, color change, and other ripening processes, often triggering a ripening wave in the fruit after exposure. Given its established role, this option correctly identifies the molecule that hastens fruit ripening.

BIOL 312 BIOL 312 - Exam 2

Which of the following molecules acts to hasten fruit ripening?

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