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Questions and Answers
Describe how an increase in ambient temperature affects the rate of transpiration in plants, and explain the underlying physiological mechanisms.
Describe how an increase in ambient temperature affects the rate of transpiration in plants, and explain the underlying physiological mechanisms.
Increased temperature generally increases transpiration rate. This happens because warmer air can hold more moisture, increasing the water potential gradient between the leaf and the air. Additionally, higher temperatures can increase the kinetic energy of water molecules, speeding up evaporation from the leaf surfaces through the stomata.
Explain the role of guard cells in regulating transpiration and how their function is affected by environmental factors such as light intensity and water availability.
Explain the role of guard cells in regulating transpiration and how their function is affected by environmental factors such as light intensity and water availability.
Guard cells regulate transpiration by controlling the opening and closing of stomata. In high light, guard cells accumulate ions, leading to water influx and stomatal opening, facilitating CO2 uptake for photosynthesis. Under water stress, abscisic acid (ABA) triggers stomatal closure to conserve water.
Many adaptations exist for plants in arid environments to reduce water loss. Describe two structural or physiological adaptations that plants use to minimize transpiration. For each, explain the mechanisms by which these adaptations reduce water loss.
Many adaptations exist for plants in arid environments to reduce water loss. Describe two structural or physiological adaptations that plants use to minimize transpiration. For each, explain the mechanisms by which these adaptations reduce water loss.
One adaptation is having smaller or fewer leaves, reducing the surface area available for transpiration. Another example is the presence of a thick waxy cuticle on leaf surfaces to prevent water evaporation.
Explain how humidity affects the rate of transpiration in plants. How does this relationship influence the plant's ability to cool itself through transpiration?
Explain how humidity affects the rate of transpiration in plants. How does this relationship influence the plant's ability to cool itself through transpiration?
Describe the cohesion-tension theory of water transport in plants. How do cohesion and adhesion contribute to the movement of water from the roots to the leaves against gravity?
Describe the cohesion-tension theory of water transport in plants. How do cohesion and adhesion contribute to the movement of water from the roots to the leaves against gravity?
Flashcards
Temperature & Transpiration
Temperature & Transpiration
Increased temperature increases transpiration by allowing warmer air to hold more moisture and speeding up water evaporation from leaves.
Guard Cell Function
Guard Cell Function
Guard cells control stomata opening/closing. High light opens stomata for CO2. Water stress closes stomata via ABA to conserve water.
Adaptations to Reduce Transpiration
Adaptations to Reduce Transpiration
Plants reduce water loss via small leaves (less surface area) and thick waxy cuticles (preventing evaporation).
Humidity's Effect on Transpiration
Humidity's Effect on Transpiration
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Cohesion-Tension Theory
Cohesion-Tension Theory
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