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← Theoretical 2

Q65 — Arabidopsis Sun vs Shade Leaves — Cross-Section Comparison

Theoretical 2 Real exam question — full text reproduced under IBO's CC BY-NC-SA 4.0 license
Leaf Anatomy

The following images are cross-sections of two different leaves of the same individual of Arabidopsis thaliana.

Figure 1. Cross-sections of two leaves of A. thaliana. Left: a thicker leaf with well-developed, elongated palisade mesophyll (label 1) and looser cells beneath (label 2/3). Right: a thinner leaf with less organized mesophyll, palisade (1) and spongy mesophyll (3) labeled. Figure 1. Cross-sections of two leaves of A. thaliana, with cell types labeled 1, 2, and 3.

Use the information and figures to determine whether the following statements are true or false.

A. The cells labeled with 1 capture and assimilate CO2 into sugars.
B. The cells labeled with 2 demonstrate Kranz anatomy.
C. The leaf on the left was grown under direct sunlight, while the leaf on the right was in the shade.
D. The cells labeled with 3 have a lower Rubisco/chlorophyll ratio than cells labeled with 1.
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Question reproduced from IBO 2022, Theoretical Paper 2, licensed under CC BY-NC-SA 4.0 — attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)