Plant Systems, Transport And Response: Question Preview (ID: 24035)

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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) Mature leaf to root
b) storage organ (i.e. potato) in summer to leaf
c) growing root to growing leaf
d) shoot tip to mature leaf

Which is not true for the opening of stomata?
a) The guard cells are turgid
b) The water potential of the guard cells is positive
c) The water potential of the guard cells is equal to surroundings
d) The rate of transpiration is acceptable to the plant

Which does not travel through the stomata (in or out)?
a) carbon dioxide
b) oxygen
c) phosphate ions
d) water

What is the best location for a receptor?
a) cell membrane
b) nuclear membrane
c) endoplasmic reticulum
d) cytoplasm

How do plants turn towards the sun?
a) cells on the dark side expand faster
b) plants have muscles
c) the force and midichlorians
d) the gravity of the sun

Guttation is when little droplets of water form over stomata-when might this happen?
a) windy day
b) rate of water movement due to pressure build up is greater than transpiration/evaporation
c) roots don't absorb water
d) water potential in roots is low

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

What roles do mycorrizhae play?
a) exchange minerals for sugar
b) speed up water uptake in roots
c) change pH of soil to facilitate uptake of phosphate (creating H+ gradient)
d) all of the above

Which of the following is PASSIVE transport?
a) water entering cell through aquaporin
b) pumping ions against a gradient
c) endocytosis
d) hydrolyzing ATP to move a solute into a cell

Which of these does not have an impact on water potential?
a) concentration of solute
b) pressure exerted by cell wall
c) age of a cell
d) particles that attract water

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 until the concentration of solutes inside and outside were equal, and the plant would burst
b) The plant cell would absorb water, but the pressure would prevent the concentration inside becomin equal to outside.
c) Water would leave the plant cell.
d) The rate of water in and out would be equal, resulting in no net flow of water.

What is the role of aquaporins?
a) allow water to tear apart a membrane
b) allow water to travel into a cell against the gradient
c) increase the water potential of a cell
d) increase rate of PASSIVE water flow in (or out of a cell)

Which type of transport is active?
a) loading of sugar into sieve tube
b) movement of water through aquaporin
c) H+ moving through proton pump in cell
d) turgor pressure pushing water from one cell into another

Which of the following is related to photoperiodism-light periods?
a) circadian rhythms
b) phototropism
c) thigmotropism
d) gravitropism

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) no, plant hormones have to interact with eachother, one may become active while another inactive
c) what you talkin' about, Willis?
d) um, maybe

What can plant hormones do?
a) change gene expression
b) cause multiple responses
c) control growth, development which includes division, elongation and differentiation
d) all of the above

Plants are most likely to open stomata when they can carry out photosynthesis, which color might be best for this?
a) blue
b) red
c) far red
d) violet

What's the order?
a) stimulus, signal, response
b) response, signal, stimulus
c) signal, stimulus, response
d) signal, response, stimulus

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