In terrestrial plants, the type of gaseous exchange that takes place is called photosynthesis during the day and respiration at all times.
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Photosynthesis: This process occurs primarily in the chloroplasts of plant cells, where plants take in carbon dioxide (CO2) from the atmosphere through small openings called stomata. They use sunlight to convert CO2 and water (H2O) into glucose and oxygen (O2). The oxygen produced is released back into the atmosphere.
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Respiration: This process occurs continuously, both day and night, where plants take in oxygen to break down glucose for energy, producing carbon dioxide and water as byproducts, which are then released back into the environment.
Overall, the exchange of gases (O2 and CO2) occurs through the stomata and is essential for both the processes of photosynthesis and respiration in terrestrial plants.