Q7 - Tidal Pressure Changes Drive Mangrove Root Gas Exchange
Mangrove trees grow in intertidal flats, and can have vertical roots (pneumatophores) which act like snorkels for the submerged roots. The mechanism through which they facilitate gas exchange was investigated by recording gas pressures, relative to atmospheric air, as pneumatophores are covered and uncovered by the tide.
Using the information and data, determine which of the statements are true or which are false.
A. Air is sucked into roots when pneumatophores are revealed by falling tides.
B. Respiration in the roots contributes to the air pressure changes in the roots.
C. Pneumatophores supply CO for photosynthesis. 2
D. Respiration rate in the roots slows when pneumatophores are submerged.
Question reproduced from IBO 2017, Theoretical Exam B, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Official answer key & worked solutions