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← Theoretical 1

Q17 — Plant Organ Modifications — Shoot vs. Leaf Origin

Theoretical 1 Real exam question — full text reproduced under IBO's CC BY-NC-SA 4.0 license
Stem Anatomy Leaf Anatomy

The following figures indicate various modifications of plant organs (I–VI).

Six illustrations (I-VI) of modified plant organs: tendrils, thorns, and spines arising from either stems or leaves. Six modified plant organs (I–VI): tendrils, thorns, and spines, each arising from either stem or leaf tissue.

Using the information and figures, determine whether the following statements are true or false:

A. I, II, IV are modifications of the shoot.
B. III, IV are modifications of the leaf.
C. II, V, VI are modifications of the leaf.
D. II, V, VI are modifications of the shoot.
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Question reproduced from IBO 2022, Theoretical Paper 1, licensed under CC BY-NC-SA 4.0 — attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)