Transpiration

Transpiration is the process of water loss in plants, primarily through stomata, cuticle, and lenticels. Stomatal transpiration accounts for 90% of water loss. Guard cells control stomatal openings, influenced by intrinsic factors like root-shoot ratio and leaf structure, and environmental factors such as light, humidity, temperature, and wind. Transpiration aids in nutrient distribution, cooling, and is considered a necessary evil due to water loss.

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

• Stomatal transpiration

• Cuticular transpiration

• Lenticular transpiration

• Root transpiration

What is the shape of guard cells in dicot plants?

• Dumbbell-shaped

• Round

• Kidney-shaped

• Square

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

• Stops transpiration completely

• Increases the rate of transpiration

• Decreases the rate of transpiration

• Has no effect on 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 stops completely

• It remains constant

• It decreases

• It increases

How does wind affect the rate of transpiration?

• Has no effect

• Decreases the rate

• Increases the rate

• Stops transpiration

What is one positive effect of transpiration on plants?

• Cools the leaves

• Reduces mineral absorption

• Causes water loss

• Increases soil erosion