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Transport of Water and Mineral Salts
Transport of Water and Mineral Salts
4.2
Transport of Water and Mineral Salts
Water and mineral salts can be transported from soil to leaves or shoots by
root pressure,capillary action
and
transpirational pull.
Root pressure
Force created in root due to the presence of endodermis
Endodermal cells transport mineral salts actively from cortex to vascular tissues of root
This produces a concentration gradient between cortex and vascular tissue
Water diffuses from cortex to vascular tissue across the endodermis
Root pressure is created by pushing water up to stem
Capillary action
Created by adhesion force and cohesion force of water in fine xylem vessels
Transpitational pull
In leaf,water always evaporates from spongy mesophyll cells to leaves and finally to atmosphere via stomata
This process is known as transpiration
This creates a force which transport water and mineral salts from root xylem up to leaf continuously due to cohesive and adhesive forces of water
Transpirational pull is the main force in transportation of water and mineral salts
Guttation
Guttation is the process of removing water slowly in the form of droplets through hydatod at the margin of the leaf
Guttation occurs at night where the rate of transpiration is low and the relative air humidity is high
Root hair is the main force in guttation
This phenomenon can be observed at the leaf margin of herbaecious plant
If the plants do not undergo transpiration and guttation:
Water and mineral salts cannot be trasnported from root to shoot
The rate of photosynthesis is low due to deficiency of water
Growth of plant is retarded because lack of mineral salts
Cooling effect of plant is low
Guttation
Transpiration
Occurs at night
Transport of water and mineral salts
Occurs all day
Through hydotod
Involves xylem
Through stomata
In the form of water droplets
Root pressure
In the form of water vapour
Chapter : Transportation in Plants
Topic : Transportation of Water and Mineral Salts
Form 5
Biology
View all notes for Biology Form 5
Related notes
Vascular Tissues
Translocation
Phytoremediation
Organisation of Plant tissue
Meristematic Tissues and Growth
Growth Curves
Leaf Structure
Main Organ for Gaseous Exchange
Main Organ for Transpiration
Main Organ for Photosynthesis
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