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← Theoretical 1

Q19 — Plant Life Cycles — Water-Dependent Fertilization

Theoretical 1 Real exam question — full text reproduced under IBO's CC BY-NC-SA 4.0 license
Plant Body Plans Across Major Lineages

The following figures demonstrate the life cycles of some plants (Species I–IV).

Four plant life-cycle diagrams (Species I-IV), illustrating different fertilization mechanisms. Life cycles of Species I–IV.

In the presence of water, determine whether fertilization occurs (true) or not (false) in the following species:

A. Fertilization in the presence of water occurs in Species I.
B. Fertilization in the presence of water occurs in Species II.
C. Fertilization in the presence of water occurs in Species III.
D. Fertilization in the presence of water occurs in Species IV.
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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)