This photomicrograph illustrates several xerophytic adaptations in leaf tissue. Which row gives the correct functions of structures 1, 2 and 3?
- Areduces the water vapour concentration gradient between the inside and outside of the leaf: 1, 2 and 3; reduces evaporation from the epidermis: 3 only; traps a layer of moist air: 2 only
- Breduces the water vapour concentration gradient between the inside and outside of the leaf: 1 and 2 only; reduces evaporation from the epidermis: 1, 2 and 3; traps a layer of moist air: 1 and 2
- Creduces the water vapour concentration gradient between the inside and outside of the leaf: 1 only; reduces evaporation from the epidermis: 2 and 3 only; traps a layer of moist air: 1 and 2
- Dreduces the water vapour concentration gradient between the inside and outside of the leaf: 2 and 3 only; reduces evaporation from the epidermis: 1 and 2 only; traps a layer of moist air: 1 only