This document is an outline for a presentation on transpiration in plants. It defines transpiration as the movement of water through a plant and evaporation from aerial parts, especially leaves. It describes the three main types of transpiration as cuticular, lenticular, and stomatal transpiration. It explains that transpiration allows for diffusion of carbon dioxide for photosynthesis, cools the plant, and enables absorption of minerals and water from the roots to shoots. The outline concludes by noting the next lab will cover mineral nutrition in plants.

1. University of Salahaddin-Erbil
College of Education
Biology department
Halala Rahman Qadir
M.Sc. Plant physiology
2014
1

2. Outline
Define Transpiration and explain
why it occurs in plants.
Types of Transpiration
Importance of Transpiration to
plant.
2

3. Definition of Transpiration
Transpiration: is the process of water movement
through a plant and its evaporation from aerial parts
especially from leaves.
3

4. Types of Transpiration
Cuticular
Lenticular
Stomatal
4

5. Types of Transpiration
1. Cuticular Transpiration: the loss of water through
the cuticle is known as Cuticular transpiration.
Water
Cross section of leaf
5

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.
6

7. Types of Transpiration
3. Stomatal Transpiration: Stomata are minute
pores confined to epidermis of green shoot
and leaves.
7

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.
8

9. Experiment about Transpiration
9

10. Homework
What is the difference between
transpiration and guttation?
10

11. Next lab
We will talk about the
mineral nutrition in plant.
11

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.
12

13. 13