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Biology 2 - C05 - 01

🧬📗1️⃣ Module 5 - Plant Gas Exchange - SET 1

QuestionAnswer
Gas exchange Movement of O2 and CO2 between an organism and its environment.
Photosynthesis Process where plants convert CO2 and water into glucose and O2 using sunlight.
Stomata Small pores on leaves/stems that regulate gas exchange and water loss.
Guard cells Paired cells controlling stomatal opening and closing.
Stomatal opening Guard cells take in K+ and Cl–, water enters, cells become turgid, pore opens.
Stomatal closing Triggered by water stress, darkness, or ABA; ions exit guard cells, pore closes.
Abscisic acid (ABA) Hormone that promotes stomatal closure during drought.
Transpiration Loss of water vapor through stomata; drives water movement in plants.
Lenticels Corky openings on woody stems for gas exchange.
CO2 uptake CO2 enters through stomata for photosynthesis.
O2 release Oxygen exits stomata as a byproduct of photosynthesis.
Blue light effect Blue wavelengths stimulate K+ uptake → stomatal opening.
High CO2 effect High internal CO2 causes stomata to close.
Temperature effect Stomata close when temperature exceeds 34°C.
CAM plants Open stomata at night to conserve water in arid environments.
Dermal tissue Outer protective layer of plants; includes stomata and guard cells.
Ground tissue Internal tissue for photosynthesis, storage, and support.
Vascular tissue Conducts water, minerals, and sugars (xylem + phloem).
Gas exchange requirement Surfaces must be moist, thin, and large for diffusion.
Diffusion Movement of molecules from high to low concentration.
Created by: francisslavin002
 

 



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