Worksheet: Transpiration

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

  • AXylem
  • BPhloem

Q2:

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

  • ADiffusion
  • BRespiration
  • CTranslocation
  • DTranspiration

Q3:

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.

Q4:

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.

Q5:

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

  • ALight intensity
  • BHumidity
  • CCO2 concentration
  • DWind
  • ETemperature

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−1)
1100.17
216
325

Calculate the rate of water uptake for fan speed 2 to the correct number of significant figures.

Calculate the rate of water uptake for fan speed 3 to the correct number of significant figures.

Q7:

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.

Q8:

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

Q9:

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.

Q10:

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.

Q11:

The diagram shows a leaf in high and low humidity.

Complete the statement with “high” or “low”: If there is a lot of water vapor in the air, it is said to have humidity.

  • Ahigh
  • Blow

Complete the statement with “higher” or “lower”: A difference in concentration will be present if there is a lot of water vapor in the stomata and not much in the surrounding air.

  • Ahigher
  • Blower

Fill in the blanks: Leaves in areas of humidity have a steeper concentration gradient, so water diffuses out of the leaf .

  • Alow, faster
  • Bhigh, faster
  • Chigh, slower
  • Dlow, slower

Q12:

The diagram given shows the process of transpiration in a plant.

By what process do the plant roots absorb water from the soil?

  • ADiffusion
  • BOsmosis
  • CActive transport
  • DTranslocation

What is the scientific term given to the pores in the leaf that allow water vapor to diffuse out of the plant?

  • AGuard cells
  • BStomata
  • CAir spaces
  • DPalisade

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.