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Organs of Water Uptake and Mineral Salts
Organ for Water and Mineral Salts Uptake
3.2
Organ for Water and Mineral Salts Uptake
Organ of mineral and water uptake in root.
There are two main functions of roots:
Provide support and strength to anchor the plant in the soil
Absorb water and mineral salts from the soil and transport them to the stem and leaves
The structure of roots and their functions:
Structures
Functions
Root hairs
Adapted from epidermal cells of the roots
Increases the total surface area of the roots to increase the uptake of water and mineral salts
Root cap
Located at the tip of the root
Protects the root from damage when going through the soi
Root adaptations of water and mineral salts uptake
Structures
Functions
Epidermis
Epidermal cells are closely arranged
Thin cell walls and water-permeable cell membranes facilitate water movement in the roots
There are epidermal cells which form root hairs by elongating towards lateral sides from the outer walls
Root hair cells are not layered with cuticle to allow water absorption
The root hair cells also have big vacuoles to store water and mineral salts to increase water absorption
Cortex
Cortex is located under the epidermal layer
Has thin cell walls, facilitating water movement in the roots
The cells are loosely arranged to facilitate gaseous exchange
Most of the cortex consists of parenchyma cells
Endodermis
Separating layer between cortex and vascular cylinder
Endodermal cells are closely arranged and one cell thick
Most of the endodermal cells have suberin or lignin thickening at the walls which form Casparian strips
Endodermis allows water and mineral salts absorbed from the soil to enter the vascular cylinder, but not air bubbles
Vascular cylinder
Vascular cylinder is the root core that consists of xylem and phloem tissues surrounded by one cell thick pericycle cell tissues
Pericycle is involved in secondary growth and the formation of lateral roots.
Usually, xylem and phloem tissues are arranged in a star-shaped pattern
Xylem tissue transports water and mineral salts, whereas phloem tissue transports organic substances such as sucrose and plant hormone.
Chapter : Nutrition in Plants
Topic : Organs of Water Uptake and Mineral Salts
Form 5
Biology
View all notes for Biology Form 5
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Main Organ for Gaseous Exchange
Main Organ for Transpiration
Main Organ for Photosynthesis
Compensation Point
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