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Gas Exchange Requirement
Plants need to exchange gases (CO2 and O2) for photosynthesis and respiration.
Primary Gas Exchange Structure
Gas exchange primarily occurs through structures called stomata.
Stomatal Density
Number of stomata per unit area on a leaf.
Importance of Stomatal Density
Affects the rate of gas exchange and transpiration.
Factors Influencing Stomatal Density
Light availability, CO2 concentration, water availability.
Xylem Function
Vascular tissue transporting water from roots to leaves.
Transpiration
Loss of water vapor through stomata.
Cohesion-Tension Theory
Water is pulled upward due to transpiration; cohesion and adhesion help move water.
Adaptations to Arid Environments
Thick cuticle, sunken stomata, CAM photosynthesis.
Adaptations to Salty Environments
Salt excretion glands, selective ion uptake.
Mean
Average value.
Gas Exchange Requirement
Plants need to exchange gases (CO2 and O2) for photosynthesis and respiration.
Primary Gas Exchange Structure
Gas exchange primarily occurs through structures called stomata.
Stomatal Density
Number of stomata per unit area on a leaf.
Importance of Stomatal Density
Affects the rate of gas exchange and transpiration.
Influencing Factors
Light availability, CO2 concentration, water availability.
Xylem Function
Vascular tissue transporting water from roots to leaves.
Transpiration
Loss of water vapor through stomata.
Water is pulled