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← Theoretical 2

Q64 — The C4 Rice Project — Engineering C4 Photosynthesis into a C3 Crop

Theoretical 2 Real exam question — full text reproduced under IBO's CC BY-NC-SA 4.0 license
Calvin Cycle, Photorespiration & C4/CAM Biochemistry

The C4 Rice Project aims to introduce C4 photosynthetic traits into rice, Oryza sativa, a C3 species.

Choose whether the following statements are true or false:

A. The modified C4 rice plants will have both altered biochemical and developmental pathways.
B. The enzyme Rubisco will be non-functional in modified C4 rice plants.
C. C4 rice plants must have smaller stomatal pore size to decrease rates of transpiration and increase photosynthetic water use efficiency.
D. Genes for decarboxylase enzymes will need to be introduced into the C4 rice plants.
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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)