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WorksheetsB4.9 Rate of transpiration
Total questions: 21
Worksheet time: 11mins
Remember when you put the celery in the water? What happened to the water level by the next day?
The level dropped A LOT, because the celery sucked it up.
The level stayed the same, because the celery was dead.
The level dropped a little, because of evaporation.
When we added red food coloring to the water, what did that prove?
That the celery leaves caught the evaporating red water.
That the celery was absorbing all the red water.
That the water was passing through the celery all the way up to the leaves.
What was the name of that specialized TISSUE that looked like red tubes or straws?
xylem
phloem
roots
stems
If plants don't store up water, how does water leave the plant?
The roots get rid of excess water.
Most plants DO store water.
It is released from the leaves by TRANSPIRATION.
What is the name of the microscopic holes in leaves that are opened and closed to allow water to TRANSPIRE?
water doors
stomata
leaf eyes
transpiration holes
When water moves through the plant's xylem, what phase is it in?
Solid
Liquid
Gas
When water TRANSPIRES from the stoma into the atmosphere, what phase is it in
Solid
Liquid
Gas
What is the effect of increasing light intensity in transpiration?
It decreases transpiration rates
It increases transpiration rates
It doesn't impact the rate of transpiration
Which of the following indicates the pathway of water through a plant?
Stomata=>Root hair cell=>Xylem
Root hair cell=>Xylem=>Stomata
Xylem=>Stomata=>Root hair cell
A stoma is
an opening
a clot
a cell that captures light energy
a water tube
Which picture shows the epidermis?
The xylem and phloem together are know as
vascular bundles.
the mesophyll.
stomates.
guard cells.
The guards cells are located in the
lower epidermis.
upper epidermis.
cuticle.
palisades layer.
Select all of the environmental factors that would increase transpiration.
Increased humidity
Increased wind speed
Increased temperature
Decreased surface area
Which of the following must be done when setting up a potometer to get accurate results?
I. cut the plant shoot underwater
II. cut the plant shoot at an angle
III. seal the joints with vaseline (grease)
I and II only
I and III only
II and III only
I, II and III
Why would the tap on a potometer be opened?
to supply the plant with more water for photosynthesis
to allow more air bubbles into the apparatus
to move the air bubble back to zero so the experiment can be repeated
to allow the plant to get rid of waste products
In what direction would the air bubble in the capillary tube move when the plant transpires?
right
left
left then right
right then left
A student uses a potometer to investigate the effect of temperature on the rate of transpiration.
What would be the dependent variable in this experiment?
temperature
mass of plant
time allowed for transpiration
distance moved by bubble in a fixed time
A student uses a potometer to investigate the effect of temperature on the rate of transpiration.
What would be the independent variable in this experiment?
temperature
mass of plant
time allowed for transpiration
distance moved by bubble in a fixed time
A student recorded that the air bubble moved 35mm in 2 hours. The volume of water moved can be calculated by πr2h , where r is the radius of the tube and h is the distance moved by the bubble.
What is the rate of transpiration, in mm3 of water moved per minute?
27.5
13.7
0.23
0.46
Potomometers really measure the rate of water uptake, rather than the rate of transpiration from the leaves.
Which of the following help to explain why this is?
I. water taken in is used for photosynthesis
II. water taken in is used to provide support and prevent wilting
III. water taken in is used for respiration
I and II only
I and III only
II and III only
I, II and III
