A level Transpiration 1

What is the primary function of the waxy cuticle on a leaf's surface?

• To facilitate photosynthesis

• To waterproof the leaf and reduce evaporation

• To allow gas exchange

• To absorb sunlight

What percentage of water loss in most plant species is accounted for by stomatal transpiration?

• 50%

• 70%

• 90%

• 100%

During which time of day are stomata typically closed?

• Morning

• Afternoon

• Night

• Midday

What accumulates in the air spaces of a leaf due to evaporation from mesophyll cell walls?

• Oxygen

• Carbon dioxide

• Water vapour

• Nitrogen

What is the process called when water vapour is lost from plants?

• Photosynthesis

• Respiration

• Transpiration

• Evaporation

Which part of the plant is primarily responsible for the inward diffusion of carbon dioxide?

• Roots

• Stomata

• Cuticle

• Mesophyll cells

What is the main consequence of stomata being open during the day?

• Increased water absorption

• Increased oxygen release

• Water vapour diffuses out

• Decreased photosynthesis

Which type of transpiration occurs through the cuticle?

• Stomatal transpiration

• Cuticular transpiration

• Mesophyll transpiration

• Root transpiration

What is the role of mesophyll cells in the process of transpiration?

• They absorb water from the soil

• They facilitate gas exchange

• They provide a surface for water evaporation

• They transport nutrients

Which of the following is NOT a factor affecting transpiration?

• Light intensity

• Humidity

• Soil type

• Temperature