A store placed a large basket of fruit containing oranges a…

Biology Plant Growth and Development Skill Builder Single Correct MCQ

Published on: August 14, 2026

A store placed a large basket of fruit containing oranges and unripe bananas by the cash register. There were too many bananas to fit in the basket, so they put the rest in the back room. The next day, the bananas in the basket had ripened, but the ones in the back room had not. What is the most likely explanation?

The heat in the store had accelerated the ripening process.

The cytokinins in the oranges diffused into the bananas where the two fruits touched each other and triggered the bananas to ripen.

The auxin in the oranges diffused into the bananas where the two fruits touched each other and triggered the bananas to ripen.

The oranges had released ethylene into the air, which triggered the bananas to ripen.

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The correct answer is:

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Oranges release a gaseous PGR known as ethylene. It is synthesised in large amounts by tissues undergoing senescence and ripening fruits.

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