7 Questions
Which solution has a higher water potential?
Solution A
What is the principle that governs the movement of water?
Water moves from the region of higher water potential to a region of lower water potential
Which part of the root is at risk of drying up if the entire surface is equally permeable?
Lower part of the root
Which pathway allows water molecules to enter the cytoplasm of the endodermis?
Apoplast pathway
What are the channels in the endodermis that facilitate the movement of water into the xylem vessels called?
Aquaporins
What happens to leaf expansion when there is water shortage?
Leaf expansion shuts down completely
What is the programmed process in plants when there is water stress?
Accumulation of solutes inside the vacuoles
Study Notes
Water Potential and Movement
- A higher water potential solution is one that has a higher concentration of water molecules.
- The principle that governs the movement of water is the movement from high water potential to low water potential.
Root Structure and Function
- If the entire surface of the root is equally permeable, the root tip is at risk of drying up.
Endodermis Function
- The symplastic pathway allows water molecules to enter the cytoplasm of the endodermis.
- The channels in the endodermis that facilitate the movement of water into the xylem vessels are called casparian strips.
Plant Response to Water Stress
- When there is a water shortage, leaf expansion is reduced or ceases.
- The programmed process in plants that occurs in response to water stress is apoptosis (cell death).
Test your knowledge of plant physiology principles with this practice exercise. Determine which solution has a higher water potential based on their respective values. Understand the movement of water and its implications in plant processes.
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