BIO 106 EXAM 1 STUDY GUIDE
QUESTIONS & VALID CORRECT
ANSWERS
What are the two key tissues that allow plants to transport water or organic nutrients,
respectively, over long distances? - Correct Answer ✔✔ Xylem-transports water from
root to shoot
Phloem-transports sugar any where it is needed in the plant body
In the root, plants need to take up more Co2 or O2? - Correct Answer ✔✔ O2
Is the need for Co2 and O2 in leaves the same when compared to roots? - Correct
Answer ✔✔ It is higher for Co2
Why do you think there is/is not a difference in gas exchange when you compare roots
with leaves? - Correct Answer ✔✔ Co2 is needed for photosynthesis which occurs in
the leaves, and O2 is cellular respiration in the roots.
If you look at the apoplast and symplast, which of the following statements are true?
(a) The apoplast is always smaller than the symlpast
(b) The apoplast is in the continuum of cytosol connected by plasmodesmata
(c) The symplast does not allow exchange of material with the apoplast
(d) Plasmodesmata connect the cytosol from neighboring cells to from the symplast, but
they do not connect to the apoplast
(e) In the symplastic route, water and solutes move along the continuum of cell walls
and extra cellular spaces - Correct Answer ✔✔ (d) Plasmodesmata connect the cytosol
from neighboring cells to from the symplast, but they do not connect to the apoplast
If you add sugar to water does the water potential increase or decrease? - Correct
Answer ✔✔ Decreases
How is osmosis defined? - Correct Answer ✔✔ The diffusion of free water that is not
bound to solutes or surfaces, that also moves across a selective permeable membrane
and does not travel against a concentration gradient.
, What is a protoplast? - Correct Answer ✔✔ The living part of a cell, which includes the
plasma membrane, it keeps the plant tissue stiff and is the driving forces of cell
elongation, NO cell wall.
How would you define transpiration?
(a) Loss of water through the roots
(b) Elongation growth in the differentiation zone
(c) Describes the long distance transport of organic material in the phloem
(d) Evaporation of water from plant leaves - Correct Answer ✔✔ (d) Evaporation of
water from plant leaves
The Casparian Strip is located in the endodermis. What is its function?
(a) It is a small strip of cytoplasm that selectively allows material to be transported into
the apoplast
(b) It is essential for the selective uptake of cytoplasmic material into the phloem of the
root vascular cylinder
(c) It is a boundary layer that blocks diffusion of material between the apoplast of the
root cortex from the apoplast of the vascular tissue
(d) It is a stainable band in the endodermis but its specific function still needs to be
resolved - Correct Answer ✔✔ (c) It is a boundary layer that blocks diffusion of material
between the apoplast of the root cortex from the apoplast of the vascular tissue
What is the difference between cohesion and adhesion?
(a) Cohesion describes the interaction between water and cell wall molecules while
adhesion describes interaction of molecules in the cell wall
(b) Cohesion is the hydrogen bonding among water molecules, while adhesion is the
attractive force between water molecules and other polar substances
(c) Adhesion is mainly necessary in long distance transport within the xylem, while
cohesion is the driving force in phloem long distance transport
(d) Adhesion and cohesion are basically the same as long as one looks at long distance
transport processes in the vascular tissue - Correct Answer ✔✔ (b) Cohesion is the
hydrogen bonding among water molecules, while adhesion is the attractive force
between water molecules and other polar substances
To transport water from root to shoot does the water potential in the xylem need to
become more positive or negative? Why?
QUESTIONS & VALID CORRECT
ANSWERS
What are the two key tissues that allow plants to transport water or organic nutrients,
respectively, over long distances? - Correct Answer ✔✔ Xylem-transports water from
root to shoot
Phloem-transports sugar any where it is needed in the plant body
In the root, plants need to take up more Co2 or O2? - Correct Answer ✔✔ O2
Is the need for Co2 and O2 in leaves the same when compared to roots? - Correct
Answer ✔✔ It is higher for Co2
Why do you think there is/is not a difference in gas exchange when you compare roots
with leaves? - Correct Answer ✔✔ Co2 is needed for photosynthesis which occurs in
the leaves, and O2 is cellular respiration in the roots.
If you look at the apoplast and symplast, which of the following statements are true?
(a) The apoplast is always smaller than the symlpast
(b) The apoplast is in the continuum of cytosol connected by plasmodesmata
(c) The symplast does not allow exchange of material with the apoplast
(d) Plasmodesmata connect the cytosol from neighboring cells to from the symplast, but
they do not connect to the apoplast
(e) In the symplastic route, water and solutes move along the continuum of cell walls
and extra cellular spaces - Correct Answer ✔✔ (d) Plasmodesmata connect the cytosol
from neighboring cells to from the symplast, but they do not connect to the apoplast
If you add sugar to water does the water potential increase or decrease? - Correct
Answer ✔✔ Decreases
How is osmosis defined? - Correct Answer ✔✔ The diffusion of free water that is not
bound to solutes or surfaces, that also moves across a selective permeable membrane
and does not travel against a concentration gradient.
, What is a protoplast? - Correct Answer ✔✔ The living part of a cell, which includes the
plasma membrane, it keeps the plant tissue stiff and is the driving forces of cell
elongation, NO cell wall.
How would you define transpiration?
(a) Loss of water through the roots
(b) Elongation growth in the differentiation zone
(c) Describes the long distance transport of organic material in the phloem
(d) Evaporation of water from plant leaves - Correct Answer ✔✔ (d) Evaporation of
water from plant leaves
The Casparian Strip is located in the endodermis. What is its function?
(a) It is a small strip of cytoplasm that selectively allows material to be transported into
the apoplast
(b) It is essential for the selective uptake of cytoplasmic material into the phloem of the
root vascular cylinder
(c) It is a boundary layer that blocks diffusion of material between the apoplast of the
root cortex from the apoplast of the vascular tissue
(d) It is a stainable band in the endodermis but its specific function still needs to be
resolved - Correct Answer ✔✔ (c) It is a boundary layer that blocks diffusion of material
between the apoplast of the root cortex from the apoplast of the vascular tissue
What is the difference between cohesion and adhesion?
(a) Cohesion describes the interaction between water and cell wall molecules while
adhesion describes interaction of molecules in the cell wall
(b) Cohesion is the hydrogen bonding among water molecules, while adhesion is the
attractive force between water molecules and other polar substances
(c) Adhesion is mainly necessary in long distance transport within the xylem, while
cohesion is the driving force in phloem long distance transport
(d) Adhesion and cohesion are basically the same as long as one looks at long distance
transport processes in the vascular tissue - Correct Answer ✔✔ (b) Cohesion is the
hydrogen bonding among water molecules, while adhesion is the attractive force
between water molecules and other polar substances
To transport water from root to shoot does the water potential in the xylem need to
become more positive or negative? Why?
