TANSPIRATION

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Last updated 7:53 AM on 7/16/23
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20 Terms

1
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What is Transpiration
Loss of water from plants in the form of vapor
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Evaporation of water
The first phase of transpiration, where water evaporates in mesophyll cells bordering intercellular spaces
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Diffusion
The second phase of transpiration, where water evaporates via diffusion due to high temperature
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Importance of transpiration
Transpiration controls water movement, supplies photosynthesis, transports minerals, and cools the plant through evaporation
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Cuticular Transpiration
Loss of water through the cuticle, which accounts for nearly 20% of total water loss in plants
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Lenticular transpiration
Loss of water through lenticels in woody stems and fruits, contributing 1-5% of total water loss in plants
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Stomatal transpiration
Maximum loss of water (80-90%) from plant tissues through stomatal openings
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Mechanism of stomatal action
Guard cells control stomatal opening and closing by changing shape and turgor pressure
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Control of water movement
Stomata and root absorption control the flow of water in plants
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Factors affecting transpiration
Temperature, relative humidity, wind and air movement, soil moisture availability, and type of plant all influence the rate of transpiration
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What is two phases of transpiration

1. EVAPORATION OF WATER
2. DIFFUSION
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STATE TWO(2) importance of transpiration
* Supply photosynthesis
* it control water movement
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State two(2) general mechanism of water movement
* Plant depend on a vascular system connecting root to shoot
* Water lost through transpiration.
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Which organ control the water movement?
Stromata and Root
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What happened if the guard cell take in water by osmosis?
They become turgid and swell
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What happened if the guard cell swell?
the gap between the guard cell widens
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what happened if the guard cell become flaccid and gap close?
The plant loses water
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What pressure inside mesophyll cell of leaf forces water outward through the cell wall?
Turgor pressure
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Water is collected in the intercellular spaces, from that, what happened to the water
The water diffuses out of the stomata into the atmosphere
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State the factor affecting transpiration
* TEMPERATURE
* RELATIVE HUMIDITY
* WIND AND AIR MOVEMENT
* SOIL MOISTURE AVAILABILITY
* TYPE OF PLANT