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Main Organ of Transpiration
Main Organ for Transpiration
2.3
Main Organ for Transpiration
The Necessity of Transpiration in Plants
Transpiration
is the
loss of water
as water vapour from plants especially from leaves to surrounding through
evaporation
.
Leaves serve as the main organ to ensure transpiration takes place in plants
The
importance
of transpiration:
Ensures water and mineral salts can be transported continuosly within vascular tissues.
Supplies water to spongy mesophyll cells for photosynthesis.
Supplies water and mineral salts for cell development and growth
Gives cooling effect to plants.
The Environmental Factors that Affect the Rate of Transpiration
Light Intensity
In daylight, light intensity is high, this wil stimulate opening of stomata and then increases the rate of transpiration.
At a light intensity where the rate of transpiration is maximum, the increasing in light intensity does not increase the rate of transpiration because all stomata are opened.
The opening of stomata due to high light intensity is to uptake more carbon dioxide for photosynthesis.
Temperature
Kinetic energy of water molecules increses when the surrounding temperature increases.
When the surrounding temperature increases,water vapour in air spaces diffuse rapidly into surrounding through osmosis.
The rate of transpiration increases.
When the surrounding temperature too high,the rate of transpiration decreases due to closing of stomata to conserve water in plants.
Air Movement
A rapid movement of air remove water vapour from leaves rapidly.
The water vapour in air spaces diffuses out rapidly.
The rate of transpiration decreases.
Relative Air Humidity
When the relative humidity of surrounding air is lower than those in air spaces within leaves, the water vapour within air spaces diffuses out rapidly.
Thus, the rate of transpiration is high
As the relative humidity of surrounding air increases, the water vapour within the air spaces diffuses out is slower.
Thus,the rate of transpiration decreases.
Main Organ for Transpiration
2.3
Main Organ for Transpiration
The Necessity of Transpiration in Plants
Transpiration
is the
loss of water
as water vapour from plants especially from leaves to surrounding through
evaporation
.
Leaves serve as the main organ to ensure transpiration takes place in plants
The
importance
of transpiration:
Ensures water and mineral salts can be transported continuosly within vascular tissues.
Supplies water to spongy mesophyll cells for photosynthesis.
Supplies water and mineral salts for cell development and growth
Gives cooling effect to plants.
The Environmental Factors that Affect the Rate of Transpiration
Light Intensity
In daylight, light intensity is high, this wil stimulate opening of stomata and then increases the rate of transpiration.
At a light intensity where the rate of transpiration is maximum, the increasing in light intensity does not increase the rate of transpiration because all stomata are opened.
The opening of stomata due to high light intensity is to uptake more carbon dioxide for photosynthesis.
Temperature
Kinetic energy of water molecules increses when the surrounding temperature increases.
When the surrounding temperature increases,water vapour in air spaces diffuse rapidly into surrounding through osmosis.
The rate of transpiration increases.
When the surrounding temperature too high,the rate of transpiration decreases due to closing of stomata to conserve water in plants.
Air Movement
A rapid movement of air remove water vapour from leaves rapidly.
The water vapour in air spaces diffuses out rapidly.
The rate of transpiration decreases.
Relative Air Humidity
When the relative humidity of surrounding air is lower than those in air spaces within leaves, the water vapour within air spaces diffuses out rapidly.
Thus, the rate of transpiration is high
As the relative humidity of surrounding air increases, the water vapour within the air spaces diffuses out is slower.
Thus,the rate of transpiration decreases.
Chapter : Structure and Leaf Function
Topic : Main Organ of Transpiration
Form 5
Biology
View all notes for Biology Form 5
Related notes
Leaf Structure
Main Organ for Gaseous Exchange
Main Organ for Photosynthesis
Compensation Point
Organisation of Plant tissue
Meristematic Tissues and Growth
Growth Curves
Main Inorganic Nutrients
Organ for Water and Mineral Salts Uptake
Diversity in Plant Nutrition
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