Specialised Plant Cells (AQA A-Level Biology): Flashcards
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Where are root hair cells located?
Where are root hair cells located?
Projecting from the epidermis of plant roots
Root hair structure
Root hair structure
Extension of the main cell, not a separate cell
Function of root hair cells
Function of root hair cells
Absorb water and mineral ions from soil
Define osmosis
Define osmosis
Water movement from higher to lower water potential through a partially permeable membrane
How are mineral ions absorbed by roots?
How are mineral ions absorbed by roots?
By active transport
Xylem vessel structure
Xylem vessel structure
Dead, hollow tubes with lignified walls
What is lignin?
What is lignin?
Complex polymer that provides strength and waterproofing
What is lignification?
What is lignification?
Process where cell walls are thickened and impregnated with lignin
Why are dead cells advantageous in xylem?
Why are dead cells advantageous in xylem?
Create unobstructed pathway with no cytoplasm to impede water flow
What is the transpiration stream?
What is the transpiration stream?
Continuous flow of water from soil, through plant, to atmosphere