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- 1. Multiple Choice
Structure of phloem consists all below, except?
Sieve tube element
Stomata
Companion cell
Sieve plate
- 2. Multiple Choice
What is the most abudant solute in phloem sap?
amino acids
hormones
sugar
minerals
- 3. Multiple Choice
Process in which food substances are moved to the rest of plant by phloem is known as
transpiration
respiration
photosynthesis
translocation
- 4. Multiple Choice
What happens first during translocation in the phloem?
water enters the phloem by osmosis
sucrose enters the phloem by active transport
water leaves the phloem by osmosis
sucrose leaves the phloem by active transport
- 5. Multiple Choice
Which of the following allows transport of substances from a companion cell to a sieve tube cell (or visa versa)?
sieve plate
plasmodesmata
cell wall
cotransport protein
- 6. Multiple Choice
The pressure involved in phloem translocation originates from
The root pressure
Transpiration in the leaves
Accumulation of minerals and water in leaves
The intake of water by sieve tubes in the leaves
- 7. Multiple Choice
The pressure flow model for phloem translocation states..
that sink strength drives transport in the pholem
that transport in treachery elements is pressure dependent
the water potential gradient in the sieve elements drives transport
the pressure gradient between the sieve elements at the source and the sink drives phloem transport
- 8. Multiple ChoiceWhat molecule is the phloem responsible for transporting?GlucoseWaterSucroseGlycogen
- 9. Multiple Choice
What is the best words to describe sugar source and sugar sink
Both are plants organ and act as storage
Sugar sink can be either roots, fruit or mature leaves and sugar source is shoots
Sugar source act as site for sugar production and sugar sink will store sugar
Companion tube carry food from a sugar source to a sugar sink
- 10. Multiple Choice
In an apple tree, 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 apple
(i) the trunk (ii) a leaf
(i) the roots (ii) a growing shoot
(i) a growing shoot (ii) a leaf
- 11. Multiple Choice
Which of the following statement is true about sieve tube cells?
Sieve tube cells are nucleated but devoid of mitochondria and ER
Companion cells are non-nucleated and regulated by nucleated sieve cell
Sieve tube cells are present in all plants
Companion cells are nucleated and regulates activity of non-nucleated sieve tube
- 12. Multiple Choice
Active transport is the movement of substances
from an area of lower concentration to higher concentration
from an area of lower concentration to lower concentration
from an area of higher concentration to lower concentration
from an area of higher concentration to higher concentration
- 13. Multiple Choice
Which of the following functions as a source during translocation in plants?
Merismetic tissue in the root
Leaves
Roots
Fruits and flowers
- 14. Multiple Choice
The loading of sucrose into sieve tubes is by ________ transport and consequently, requires ___________.
Active; ATP
Passive; energy
Active; ions
Passive;ions
- 15. Multiple Choice
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
- 16. Multiple Choice
What happen to the osmotic pressure in sieve tube due to high concentration of sucrose?
Increase
Decrease
No change
- 17. Multiple Choice
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
- 18. Multiple Choice
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
- 19. Multiple ChoiceWhich part of the aphid will reach into which structure in the plant?tail piece; phloemstylet; xylemtail piect; pithstylet; phloem
- 20. Multiple ChoiceWhat is the main explanation for the fact that water can cause hydrostatic pressure?Because it is incompressible.Because it is polar.Because it attracts other water molecules.Because it exhibits electronegativity.
- 21. Multiple ChoiceWhich cells are alive but lack organelles?Xylem cellsTracheid cellsCompanion cellsSieve tube cells
- 22. Multiple ChoiceWhat is the name for the structures that allow flow of material between phloem cells?CelluloseSieve plateSieve cellTrachieds
- 23. Multiple ChoiceWhy must radioactive CO2 be used when tracing phloem flow?It is incorporated into the phloem cellsIt is incorporated into the minerals in the phloemIt is incorporated into the sucrose during cellular respirationIt is incorporated into the sucrose during photosynthesis
- 24. Multiple ChoiceWhere is phloem tissue found in a stem?On the side facing the epidermis in the vascular bundle.One the side facing the pith in the vascular bundle.Distributed with some facing the epidermis and some facing the pith.Only in the middle of the vascular bundle.
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