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Biology, Science
12th
grade
8.3 Transport in plants - Pressure Flow Hypothesis
10 questions
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- 1. Multiple Choice
Structure of phloem consists all below, except?
Sieve tube
Tracheids
Companion cell
Sieve plate
- 2. Multiple Choice
What is the most abudant solute in phloem sap?
starch
glucose
sucrose
water
- 3. Multiple Choice
Process in which organic substances are moved to the rest of plant by phloem is known as
transpiration
cellular respiration
photosynthesis
translocation
- 4. Multiple Choice
What happens FIRST during translocation in the phloem?
water enters the sieve tubes from xylem vessel by osmosis
sucrose enters the sieve tubes from source cell by active transport
water leaves the sieve tubes to xylem vessel by osmosis
sucrose leaves the sieve tubes to sink cell
- 5. Multiple Choice
Which of the following allows transport of sucrose from a sieve tube to a companion cell?
sieve plate
plasmodesmata
cell wall
pits
- 6. Multiple Choice
Translocation may occur as describe in Pressure Flow hypothesis. The pressure involved in this hypothesis originates from
The root pressure
Transpirational pull in the leaves
Accumulation of sucrose in sieve tube
The intake of water by sieve tube from xylem vessel by osmosis
- 7. Multiple Choice
The Pressure Flow hypothesis for phloem translocation states..
that sink strength drives transport in the pholem
that transport in companion cell is pressure dependent
the water potential gradient in the sieve tube drives phloem transport
the pressure gradient between the sieve tube at the source and the sink drives phloem transport
- 8. Multiple Choice
What molecule is the phloem responsible for transporting?
Glucose
Fructose
Sucrose
Starch
- 9. Multiple Choice
What is the best words to describe source and sink cell?
Both are plants organ and act as storage
Sink cell can be either fruit or leaves and source cell is root
Source cell act as site for sugar production and sink cell will store sugar
Companion cell carry sucrose from a source cell to a sink cell
- 10. Multiple Choice
In a tree during normal condition, it is expected that the sugars produced by the tree would flow from (i)____________ to (ii)__________________.
Choose the option that would correctly fill in the terms in the sentence above.
(i) a leaf (ii) a growing fruit
(i) the root (ii) a leaf
(i) the root (ii) a growing fruit
(i) a growing fruit (ii) a leaf
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