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IB Biology HL C3.1.23 Hl Ethylene and Fruit Ripening Questions

Explore how gaseous ethylene initiates fruit ripening and how ethylene released by ripening fruit accelerates ripening in nearby fruit through positive feedback in IB Biology HL…

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Identify ethylene as a gaseous phytohormone that directly promotes fruit ripening.
  • Explain positive feedback in which ripening fruit releases more ethylene, stimulating further ripening in nearby fruit.

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Study C3.1.23 (HL)—Ethylene and fruit ripening conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL C3.1.23 Hl Ethylene and Fruit Ripening Questions question 1

[Maximum number: 1]

What plays a direct role in promoting the ripening of fruit?

A

Oestradiol

B

Auxin

C

Cytokines

D

Ethylene

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