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← Theoretical 1

Q21 — Biological Samples — Identifying Diverse Organisms

Theoretical 1 Real exam question — full text reproduced under IBO's CC BY-NC-SA 4.0 license
Biomolecular Analytical Techniques

The following images depict certain biological samples (I–VIII), imaged by light and electron microscopy.

Eight microscopy images (I-VIII) of diverse biological samples: pollen tube, pollen grain, virus particle, budding yeast, diatom, fungal spore structure, flagellated bacterium, and ciliate protozoan. Eight biological samples (I–VIII): I — germinating pollen grain, II — spiky pollen grain (SEM), III — virus particle, IV — budding yeast, V — diatom (SEM), VI — fungal spore-bearing structure, VII — flagellated bacterium, VIII — ciliate protozoan.

Using the images, determine whether the following statements are true or false:

A. I, III and VI can cause diseases in humans.
B. II and IV consist of plant gametophytes.
C. II, VII and VIII belong to plankton.
D. II and V belong to autotrophic organisms.
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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)