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kahoot title By Damien, Shafik, Ignatius, Xiu Zhi and Zhi Zong, kahoot…
By Damien, Shafik, Ignatius, Xiu Zhi and Zhi Zong
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Transpiration
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Stomata
Microscopic pores found mostly on the surface of leaves that is surrounded by guard cells and can open and close in response to the environment.
Wilting
Cause
In strong sunlight, when the rate of transpiration exceeds the rate of absorption of water by the roots, the cells lose their turgor and become flaccid.
Advantages
When the leaf folds up, the surface area that is exposed to sunlight decreases causing the guard cells to become flaccid and the stomata to close, decreasing the rate of transpiration
Disadvantages
The rate of photosynthesis reduced as both water and carbon dioxide become limiting factors. Reduced surface area exposed to sunlight also decreases the rate of photosynthesis.
Adaptations
Tropical Plants
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Stomata is found in greater numbers on lower surface where it will be cooler and there is less evaporation of water
Results in less transpiration, conserving water
Xerophytic plants
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Sunken Stomata which are shielded from the wind, reducing rate of transpiration
Layer of moist air is trapped in the 'pit', decreasing the concentration gradient for water to diffuse out of the leaf
Have hairs on the surfaces of their leaves to trap a layer of moisture, hence reducing concentration gradient
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Aquatic Plants
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Most gases dissolve poorly in water and hence aquatic plants have stomata on the upper surface of the leaf so that gaseous exchange can take place
Aquatic plants do not need to have such thick lignified walls as the water column helps to support the plant
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