Transpiration

Transpiration is the process where plants lose water vapor from aerial parts. It occurs mainly through stomata, with minor contributions from cuticular and lenticular transpiration. Stomata are pores in the epidermis, controlled by guard cells, which regulate gas exchange. Transpiration is influenced by intrinsic factors like root-shoot ratio and leaf structure, and environmental factors such as light, humidity, temperature, wind, and soil water availability. It aids in water and mineral distribution, cooling leaves, and is considered a necessary evil due to water loss.

Which type of transpiration accounts for the majority of water loss in plants?

• Cuticular transpiration

• Lenticular transpiration

• Stomatal transpiration

• Root transpiration

What shape are the guard cells in dicot plants?

• Dumbbell-shaped

• Square

• Kidney-shaped

• Round

How does an increase in root-shoot ratio affect transpiration?

• Stops transpiration completely

• Has no effect on transpiration

• Increases the rate of transpiration

• Decreases the rate of transpiration

Which leaf feature is associated with slower transpiration?

• Exposed stomata

• Large surface area

• Thick cell walls

• Thin cuticle

What happens to the rate of transpiration when the air humidity is high?

• It decreases

• It remains constant

• It stops completely

• It increases

Which environmental factor disperses water vapor around the leaf, affecting transpiration?

• Humidity

• Light

• Soil water

• Wind

What is one of the benefits of transpiration in plants?

• Increases water loss

• Prevents sap ascent

• Cools the leaves

• Reduces mineral absorption