Transpiration: Definition and Types
Definition of transpiration as the evaporative loss of water by plants, primarily through stomata, and its different forms.
What is Transpiration: Definition and Types?
The process where moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere.
Key points
- Define transpiration.
- Identify the primary site of transpiration.
- Describe the role of stomata and guard cells.
- Differentiate between stomatal, cuticular, and lenticular transpiration.
Common exam trap
Confusing transpiration with guttation.
Definitions
- Term
Transpiration
- Meaning
The process where moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere.
- Term
Stomatal Transpiration
- Meaning
Water loss occurring through stomata, the primary mode of transpiration.
- Term
Cuticular Transpiration
- Meaning
Water loss occurring through the cuticle, a waxy layer on the epidermis of leaves and stems.
- Term
Lenticular Transpiration
- Meaning
Water loss occurring through lenticels, small pores in the bark of woody stems.
- Term
Guard Cells
- Meaning
Specialized epidermal cells surrounding a stoma, which control its opening and closing.
Learning objectives
Define transpiration.
Identify the primary site of transpiration.
Describe the role of stomata and guard cells.
Differentiate between stomatal, cuticular, and lenticular transpiration.
Understand the significance of transpiration for plants.
Prerequisites
Plant cell structure
Water potential
Stomata structure and function
Plant tissue types (epidermis, mesophyll)
Common mistakes
Confusing transpiration with guttation.
Underestimating the role of stomata.
Not differentiating between types of transpiration.
Ignoring the role of water potential.
Keywords
Transpiration
Water loss
Stomata
Guard cells
Cuticle
Lenticels
Evaporation
Water potential
Practice preview
Cuticular transpiration occurs through the cuticle, which is a waxy layer. What is the primary function of the cuticle in relation to water loss?…
medium
Through which plant structure does the majority of transpiration occur?…
easy
Which of the following is NOT a type of transpiration?…
easy