transpiration

1. University of Salahaddin-Erbil
College of Education
Biology department
Halala Rahman Qadir
M.Sc. Plant physiology
2014
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2. Outline
Define Transpiration and explain
why it occurs in plants.
Types of Transpiration
Importance of Transpiration to
plant.
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3. Definition of Transpiration
Transpiration: is the process of water movement
through a plant and its evaporation from aerial parts
especially from leaves.
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4. Types of Transpiration
Cuticular
Lenticular
Stomatal
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5. Types of Transpiration
1. Cuticular Transpiration: the loss of water through
the cuticle is known as Cuticular transpiration.
Water
Cross section of leaf
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6. Types of Transpiration
2. Lenticular Transpiration: Loss of water in the
form of water vapour taking place through the
lenticels present in woody stem and fruits.
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7. Types of Transpiration
3. Stomatal Transpiration: Stomata are minute
pores confined to epidermis of green shoot
and leaves.
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8. Importance of transpiration to plant
 Transpiration allow the diffusion of carbon
dioxide gas from the air for photosynthesis.
 Transpiration cools plant.
 Absorption of mineral nutrients and water
from roots to shoots.
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9. Experiment about Transpiration
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10. Homework
What is the difference between
transpiration and guttation?
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11. Next lab
We will talk about the
mineral nutrition in plant.
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12. References
1. Passarkli, M.(2002). Handbook of plant and
crop physiology. Second edition. New york.
p835
2. Taiz, L. and E. Zeiger. (2002). Plant physiology.
Annals of botany. p.35.
3. http://en.wikipedia.org/wiki/Transpiration.
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