Transpiration

The loss of water in the form of water vapour from the aerial parts of the plant?

• Transpiration
• Evaporation
• Osmosis
• Photosynthesis

Adaptations of leaves to reduce water loss?

• Waxy cuticle

• Thorns

• Stomata on lower epidermal layer

• Waxy cuticle, closed stomata, reduced surface area.
• Sunken stomata

Movement of water from an area of high-water potential to an area of low water potential until equilibrium is reached.

Which factors cause high rates of transpiration

• Increased temperature

• Low temperature

• Increased light intensity

• Decreased humidity

• Increased wind

Factors that cause low rates of transpiration?

• High humidity

• Low temperature

• High humidity

• Low light intensity

• High temperature

What is this apparatus?

• Mass potometer

• Bubble potometer

What is this apparatus called?

• Mass potometer

• Bubble potometer

What does the movement of the bubble show in a potometer?

• The temperature of the water in the potometer.
• The size of the plant's leaves.
• The amount of sunlight the plant receives.
• The rate of water uptake by the plant.

Why must the stem be cut diagonally underwater in a potometer experiment?

• To allow the stem to dry out before use.
• To reduce the surface area for water uptake.
• To prevent an air bubble form entering xylem

• To create a straight cut for better aesthetics.

Why do we use oil/vaseline in a potometer experiment?

• To enhance the flavor of the water
• To increase the rate of photosynthesis
• To provide nutrients to the plant
• To prevent water loss through evaporation and ensure accurate measurement of transpiration.