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WorksheetsPressure Flow Hypothesis
Total questions: 18
Worksheet time: 9mins
Transport of sucrose from source to the sink is
Translocation
Transpiration
Respiration
Photosynthesis
Which of the following functions as a source during translocation in plants?
Merismetic tissue in the root
Leaves
Roots
Fruits and flowers
Transport of sucrose from source to sink is via
tracheid & vessel element
sieve tube & companion cell
xylem
plasmodesmata
Which of the following is NOT functions as a sink during translocation in plants?
Shoots
Roots
Leaves
Fruits
The loading of sucrose into sieve tubes is by ________ transport and consequently, requires ___________.
Active; ATP
Passive; energy
Active; ions
Passive;ions
Some part of plant is called as source is due to the process of
Cellular respiration
Photosynthesis
Transpiration
Photorespiration
Why glucose converted to sucrose before translocation occur?
Sucrose is large molecule
Sucrose is non-reducing sugar
Sucrose is reducing sugar
Sucrose is insolluble in water
In the pressure flow hypothesis, sucrose is loading into the sieve tube by
osmosis
passive transport
active transport
diffusion
What is the important of companion cell between source and sieve tube?
Provide glucose for active transport
Provide ATP for active transport
Provide ATP for passive transport
Provide glucose for passive transport
Loading of sucrose actively in the sieve tube will causes
Water pressure in sieve tube decrease
Accumulation of sucrose in sieve tube and water potential remain unchanged
Sucrose dissolved in water and lowered the water potential in sieve tube
Sucrose converted into dissolved glucose which lowered the water potential in sieve tube
What happen to the osmotic pressure in sieve tube due to high concentration of sucrose?
Increase
Decrease
No change
Which one is NOT the effect causes by loading of sucrose into sieve tube?
Increase water potential in sieve tube
Decrease the water potential in sieve tube
Water potential in sieve tube is lower than xylem
Water diffuse from xylem into sieve tube by osmosis
In the pressure flow hypothesis of translocation, what causes the pressure?
Root pressure
The osmotic uptake of water by sieve tubes at the source
The accumulation of minerals and water by the stele in the root
The osmotic uptake of water by the sieve tubes of the sink
Movement of water from xylem into sieve tube by osmosis will create a pressure in the sieve tube which is known as
Root pressure
Osmotic pressure
Hydrostatic pressure
Water pressure
During translocation, which of the below is NOT correct about hydrostatic pressure in the sieve tube.
Hydrostatic pressure in source is higher than in sink
Hydrostatic pressure in source is lower than in sink
Hydrostatic pressure push the fluid from region with high hydrostatic pressure to lower hydrostatic presure.
Hydrostatic pressure increase due to low osmotic pressure in sieve tube
Sucrose will be uploaded from sieve tube into the sink by ______ transport, if the concentration of sucrose is higher in sieve tube.
Active
Osmosis
Passive
Simple diffusion
Sucrose will be uploaded from sieve tube into the sink by ______ transport, if the concentration of sucrose is lower in sieve tube.
Active
Osmosis
Passive
Simple diffusion
Unloading of sucrose into the sink, will causes all of these EXCEPT
Increasing of osmotic pressure in sieve tube
Higher water potential in sieve tube compare to in xylem
Water diffuse by osmosis from sieve tube to xylem
Increasing water potential in xylem and water moves upwards due to transpiration
