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Plant Systems, Transport And Response
Test Description: Whole plant interactions
Instructions: Answer all questions to get your test result.
1) Which of the following is PASSIVE transport?
A
water entering cell through aquaporin
B
hydrolyzing ATP to move a solute into a cell
C
endocytosis
D
pumping ions against a gradient
2) Which of these does not have an impact on water potential?
A
particles that attract water
B
age of a cell
C
pressure exerted by cell wall
D
concentration of solute
3) If the water potential in a cell was -.25 MPa, and the potential outside the cell was -.1, what would you expect to happen?
A
The plant cell would absorb water, but the pressure would prevent the concentration inside becomin equal to outside.
B
Water would leave the plant cell.
C
The plant cell would absorb water until the concentration of solutes inside and outside were equal, and the plant would burst
D
The rate of water in and out would be equal, resulting in no net flow of water.
4) What is the role of aquaporins?
A
allow water to tear apart a membrane
B
increase rate of PASSIVE water flow in (or out of a cell)
C
increase the water potential of a cell
D
allow water to travel into a cell against the gradient
5) Which type of transport is active?
A
loading of sugar into sieve tube
B
H+ moving through proton pump in cell
C
movement of water through aquaporin
D
turgor pressure pushing water from one cell into another
6) What roles do mycorrizhae play?
A
all of the above
B
change pH of soil to facilitate uptake of phosphate (creating H+ gradient)
C
exchange minerals for sugar
D
speed up water uptake in roots
7) Guttation is when little droplets of water form over stomata-when might this happen?
A
roots don't absorb water
B
water potential in roots is low
C
windy day
D
rate of water movement due to pressure build up is greater than transpiration/evaporation
8) The forces that drive transpiration are
A
the evaporation of water
B
cohesion of water molecules due to polarity/hydrogen bonds
C
the pressure of the cell walls
D
all of the above
9) Which does not travel through the stomata (in or out)?
A
oxygen
B
carbon dioxide
C
water
D
phosphate ions
10) Which is not true for the opening of stomata?
A
The water potential of the guard cells is positive
B
The rate of transpiration is acceptable to the plant
C
The guard cells are turgid
D
The water potential of the guard cells is equal to surroundings
11) A source is a place where compounds like glucose are made (think back to photosynthesis) and a sink is a location that would receive that compound. Which would function a source/sink?
A
storage organ (i.e. potato) in summer to leaf
B
Mature leaf to root
C
growing root to growing leaf
D
shoot tip to mature leaf
12) What is the best location for a receptor?
A
endoplasmic reticulum
B
nuclear membrane
C
cytoplasm
D
cell membrane
13) How do plants turn towards the sun?
A
the force and midichlorians
B
plants have muscles
C
cells on the dark side expand faster
D
the gravity of the sun
14) Which of the following is related to photoperiodism-light periods?
A
circadian rhythms
B
gravitropism
C
thigmotropism
D
phototropism
15) Do plant hormones act independently of each other?
A
yes, despite being part of the same organism, they stay totally isolated from each other
B
what you talkin' about, Willis?
C
um, maybe
D
no, plant hormones have to interact with eachother, one may become active while another inactive
16) What can plant hormones do?
A
cause multiple responses
B
change gene expression
C
all of the above
D
control growth, development which includes division, elongation and differentiation
17) Plants are most likely to open stomata when they can carry out photosynthesis, which color might be best for this?
A
blue
B
far red
C
red
D
violet
18) What's the order?
A
stimulus, signal, response
B
signal, response, stimulus
C
signal, stimulus, response
D
response, signal, stimulus
*select an answer for all questions
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