Lesson Worksheet: Transpiration Biology

In this worksheet, we will practice describing the process of transpiration and the effect of limiting factors on the rate of transpiration.

Q1:

What is the biological process that describes the continuous movement of water from the roots to the leaves of a plant?

• BRespiration
• CTranslocation
• DTranspiration

Q2:

Which of the following is not a limiting factor for transpiration?

• ALight intensity
• BHumidity
• C concentration
• DWind
• ETemperature

Q3:

How is water lost from the leaves of a plant?

• AIt diffuses out of the spongy mesophyll.
• BIt evaporates through the waxy cuticle.
• CIt evaporates from the stomata.
• DIt moves back to the roots by osmosis.

Q4:

What is the transport vessel that moves water from roots to leaves in the plant?

• AXylem
• BPhloem

Q5:

Which of the following best explains the relationship between temperature and the rate of transpiration?

• AAs temperature increases, the rate of transpiration increases because water molecules are actively transported out of the leaf faster.
• BAs temperature increases, the rate of transpiration decreases because water molecules diffuse from the leaf slower.
• CAs temperature decreases, the rate of transpiration increases because water molecules are actively transported out of the leaf faster.
• DAs temperature increases, the rate of transpiration increases because water molecules diffuse from the leaf faster.

Q6:

A student investigates the effect of wind speed on the rate of transpiration. They place a fan next to the leaves of a plant in a potometer and record how far the air bubble moves in 60 s.

Their results are shown below.

Fan SpeedDistance of Bubble Movement (mm)Rate of Water Uptake (mm/s)
1100.17
216
325

Calculate the rate of water uptake for fan speed 2 and give your answer to two decimal places.

Calculate the rate of water uptake for fan speed 3 and give your answer to two decimal places.

Q7:

Which of the following is not a way plants control water loss?

• APlants have guard cells that leave stomata permanently open to regulate transpiration.
• BPlants will wilt, collapsing their leaves to reduce surface area.
• CLeaves are covered in a waxy cuticle to prevent excess evaporation of water.
• DStomata will close if temperatures are too high.

Q8:

Which of the following best explains the relationship between wind and the rate of transpiration?

• AA decrease in wind speed increases the rate of transpiration as water molecules are absorbed by the leaf faster.
• BAn increase in wind speed decreases the rate of transpiration as water molecules are moved away from the leaf slower.
• CAn increase in wind speed increases the rate of transpiration as water molecules are moved away from the leaf faster.
• DA decrease in wind speed increases the rate of transpiration as water molecules are moved away from the leaf faster.

Q9:

Which of the following best explains the relationship between light intensity and the rate of transpiration?

• AAs light intensity increases, the rate of transpiration decreases because stomata are open in the dark.
• BAs light intensity increases, the rate of transpiration increases because stomata are open in the light.
• CAs light intensity decreases, the rate of transpiration increases because stomata are closed in the dark.
• DAs light intensity decreases, the rate of transpiration increases because stomata are open in the light.

Q10:

Complete the following statements with “closed” or “open.”

During the day, when there is available sunlight for photosynthesis, the stomata will be .

• Aclosed
• Bopen

During the night, the stomata will be .

• Aopen
• Bclosed

In a very hot and dry environment, the stomata will be .

• Aclosed
• Bopen

This lesson includes 19 additional questions for subscribers.