NKU BIO 669 TEST 3 EXAM STUDY GUIDE
2026 QUESTIONS AND ANSWERS
COMPREHENSIVE PREP RESOURCE
●● In roots the _____ forces water and solutes to pass through the
plasma membranes of _____ cells before entering the _____
transpiration ... endodermis ... xylem
Casparian strip ... endodermis ... phloem
xylem ... endodermis ... Casparian strip
Casparian strip ... ectoderm ... xylem
Casparian strip ... endodermis ... xylem.
Answer: Casparian strip ... endodermis ... xylem
●● _____ provide(s) the major force for the movement of water and
solutes from roots to leaves.
Transpiration
Translocation
,Bulk flow
Transfer cells
Root pressure.
Answer: transpiration
●● _____ bonds are responsible for the cohesion of water molecules.
Nonpolar covalent
Peptide
Polar covalent
Hydrogen
Ionic.
Answer: hydrogen
●● _____ cells are the cells that regulate the opening and closing of
stomata, thus playing a role in regulating transpiration.
Sieve-tube member
Guard
Companion
Casparian strip
Tracheid.
Answer: guard
,●● Which tissue acts as a filter on the water absorbed by root hairs?
Cortex
Vascular tissue
Epidermis
Endodermis.
Answer: endodermis
●● True or false? Root pressure can move water a long distance up the
xylem because of the higher water potential of the xylem in comparison
to the water potential in the surrounding cells.
True
False.
Answer: false
●● Which of the following statements about the distribution of sap
throughout a plant is true?
The mechanism that explains the movement of sugars throughout a plant
is called the pressure-flow hypothesis.
The driving force for sugar movement is transpiration.
The main component of phloem sap is glucose.
, Companion cells form the conducting tissue for sap.
Answer: The mechanism that explains the movement of sugars
throughout a plant is called the pressure-flow hypothesis
●● Which term describes an area where sugars are used or stored?
Sink
Leaves
Stomata
Source.
Answer: sink
●● Which of the following statements about xylem transport is true?
Water and minerals enter the xylem by diffusion.
All water transported by the xylem is used for photosynthesis in the
leaves.
Water and minerals move through the root cortex into the
xylem and upward through the stem and into leaves.
The xylem cells that conduct water and minerals are alive.
Answer: Water and minerals move through the root cortex into the
xylem and upward through the stem and into leaves.
2026 QUESTIONS AND ANSWERS
COMPREHENSIVE PREP RESOURCE
●● In roots the _____ forces water and solutes to pass through the
plasma membranes of _____ cells before entering the _____
transpiration ... endodermis ... xylem
Casparian strip ... endodermis ... phloem
xylem ... endodermis ... Casparian strip
Casparian strip ... ectoderm ... xylem
Casparian strip ... endodermis ... xylem.
Answer: Casparian strip ... endodermis ... xylem
●● _____ provide(s) the major force for the movement of water and
solutes from roots to leaves.
Transpiration
Translocation
,Bulk flow
Transfer cells
Root pressure.
Answer: transpiration
●● _____ bonds are responsible for the cohesion of water molecules.
Nonpolar covalent
Peptide
Polar covalent
Hydrogen
Ionic.
Answer: hydrogen
●● _____ cells are the cells that regulate the opening and closing of
stomata, thus playing a role in regulating transpiration.
Sieve-tube member
Guard
Companion
Casparian strip
Tracheid.
Answer: guard
,●● Which tissue acts as a filter on the water absorbed by root hairs?
Cortex
Vascular tissue
Epidermis
Endodermis.
Answer: endodermis
●● True or false? Root pressure can move water a long distance up the
xylem because of the higher water potential of the xylem in comparison
to the water potential in the surrounding cells.
True
False.
Answer: false
●● Which of the following statements about the distribution of sap
throughout a plant is true?
The mechanism that explains the movement of sugars throughout a plant
is called the pressure-flow hypothesis.
The driving force for sugar movement is transpiration.
The main component of phloem sap is glucose.
, Companion cells form the conducting tissue for sap.
Answer: The mechanism that explains the movement of sugars
throughout a plant is called the pressure-flow hypothesis
●● Which term describes an area where sugars are used or stored?
Sink
Leaves
Stomata
Source.
Answer: sink
●● Which of the following statements about xylem transport is true?
Water and minerals enter the xylem by diffusion.
All water transported by the xylem is used for photosynthesis in the
leaves.
Water and minerals move through the root cortex into the
xylem and upward through the stem and into leaves.
The xylem cells that conduct water and minerals are alive.
Answer: Water and minerals move through the root cortex into the
xylem and upward through the stem and into leaves.
