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WorksheetsIB Plant Transport
Total questions: 25
Worksheet time: 19mins
Which would be an adaptation of xerophytes?
Large air spaces
Large numbers of stomata
Hairs on the leaves
Reduced roots
When a farmer sprays a chemical on to crop plants, how does the chemical travel to the roots of the plants?
In the phloem, by active translocation
In the phloem, by transpiration pull
In the xylem, by transpiration pull
In the xylem, by active translocation
What conditions will cause the highest rate of transpiration in a well-watered plant?
Hot, humid with bright sunshine and still air
Low humidity, hot, bright sunshine and windy
Windy, hot, cloudy and humid
Windy, bright sunshine, humid and cool
Which direction does the phloem transport materials?
Up the plant at night and down the plant during the day
Up and down the plant all the time
Up the plant only
Down the plant only
What process creates the low pressures needed for the movement of water upwards in the xylem?
Active translocation
Active transport
Evaporation of water from mesophyll of leaves
Evaporation of water from guard cells
The diagram below shows a cross section of a stem.
What is the structure labelled Y and one of its functions?
Y = phloem; Function = storage of water and starch
Y = xylem; Function = mechanical support
Y = phloem; Function = transport of sugars
Y = xylem; Function = gas exchange
What part of the human body is most similar in function to the spongy mesophyll layer in a leaf?
Alveoli in the lungs
Erythrocytes in the blood
Villi in the small intestine
Sweat glands in the skin
How are fluids transported in the xylem and the phloem?
A
B
C
D
Which is the best definition for transpiration?
Diffusion of water through mesophyll cells followed by its evaporation from stomata
Diffusion of water through stomata followed by its evaporation from mesophyll cells
Evaporation of water at the mesophyll cells followed by its diffusion through stomata
Evaporation of water at the stomata followed by its diffusion through mesophyll cells
Which of the following are part of the cohesion-tension hypothesis?
I. evaporation of water causes a negative pressure in xylem vessels
II. water is drawn out of the xylem cell walls by cohesion
III. hydrogen bonds cause water molecule to stick together by cohesion
I and II only
I and III only
II and III only
I, II and III
An increase in which of the following would decrease the rate of transpiration?
light
air movement
temperature
humidity
Which of the following explain why an increase in temperature leads to an increase in the rate of transpiration?
I. water molecules have more kinetic energy
II. warmer air can hold more water vapour
III. more stomata will close
I only
II only
I and II only
I, II and III
Which of the following explain(s) why an increase in air movement leads to an increase in the rate of transpiration?
I. more water molecules are brought to the outside of the leaf
II. the water potential gradient is increased
III. air movements cause stomata to open
I only
II only
I and II only
II and III only
Which of the following are xerophytic adaptations?
I. sunken stomata
II. opening stomata during the day and closing them at night
III. rolled up leaves
I and II only
I and III only
II and III only
I, II and III
Which of the following is the correct order for translocation in the phloem?
I. a hydrostatic pressure gradient is created from source to sinks
II. solute concentration in the phloem increases
III. hydrostatic pressure at the source increases
IV. sucrose is loaded into sieve tubes by active transport
IV --> III --> II --> I
I --> IV --> II --> III
IV --> II --> III --> I
I --> IV --> III --> II
What is mainly responsible for transporting sucrose from source to sinks?
osmosis
active transport
diffusion
mass flow
What happens first during translocation in the phloem?
water enters the sieve tubes by osmosis
sucrose enters the sieve tubes by active transport
water leaves the sieve tubes by osmosis
sucrose leaves the sieve tubes by active transport
Which of the following explain how sucrose is loaded into sieve tubes?
I. A proton pump transports protons into phloem cells by active transport
II. Co-transporters move sucrose into phloem cells using ATP
III. Energy in a proton gradient is used to move sucrose into phloem cells
I and II only
I and III only
II and III only
III only
Which of the following are true of co-transporters?
I. They are integral membrane proteins
II. They transport two different substances at the same time
III. They use energy in a concentration gradient to transport substances
I and II only
I and III only
II and III only
I, II and III
Which of the following is not a function of lignin in xylem vessels?
prevents xylem from collapsing inwards
waterproofing to prevent water loss
makes cell wall thicker
allows water to be move into adjacent xylem vessels
What is the main reason for xylem forming a continuous water column?
Xylem cell walls contain lignin
Xylem cell walls contain pits
There are no end walls between xylem cells
There are no cell membranes
Which of the following are not found in xylem cells?
I. cytoplasm
II. cell wall
III. cell membrane
I and II only
I and III only
II and III only
I, II and III
Which of the following allow water to be eventually moved into the cell walls of adjacent leaf cells?
I. lignin
II. pits
III. adhesion
I and II only
I and III only
II and III only
I, II and III
Which of the following allows transport of substances from a sieve element cell to a companion cell?
sieve plate
plasmodesmata
cell wall
pits
Where do water molecules move to directly after the xylem?
spongy mesophyll cells
stomata
root cortex
palisade mesophyll cells
