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exam 3 biol121
Terms in this set (34)
Based on a U-tube (study guide, Fig. 7.11) filled on both sides with pure water at equilibrium, what happens if you add a solute to the right side of the U-tube?
water will move from the left side (with high concentration of water) to right side (with lower concentration of water)
When using the water potential equation to determine the direction in which water will move, which of the following is true?
water will move from a more positive water potential to a more negative water potential
Based on Fig. 36.7, if you have a flaccid plant cell (what does that mean?) with a solute component of -0.5 MPa and you place the cell into a solution (much bigger in volume than cell) which has a total water potential of -1.0 MPa, which of the following is true?
when the cell comes into equilibrium with the solution, the pressure component will be +0.5 MPa
Imagine a cell (like a green algae cell) with an internal sucrose concentration of 0.5 mM that is placed in a solution with a sucrose concentration of 0.1 mM. Which of the following would be true?
Uptake of sucrose by the cell from the solution could only occur by secondary active transport or primary active transport
Which of the following is true of osmosis
it is the diffusion of water across a selectively permeable membrane
Based on a U-tube (study guide, Fig 7.11), which of the following would be true about a U-tube filled with pure water at equilibrium (on both sides of membrane) and with no applied pressure.
The solute component on both sides would be zero. The pressure component on both sides would be zero and the total water potential on both sides would be zero and there would be no net movement of water in either direction
In the process of phloem loading, where and when would you expect to find high concentrations of H+ in the following cells or cell wall spaces?
in the cell wall space of a sieve tube cell, during the day when photosynthesis and phloem loading are occurring
Potassium is the major solute involved in the opening and closing of stomata. Where and when would you expect to find high concentrations of K+ in the following cells?
Inside a guard cell when the guard cells are turgid
inside the cells adjacent/neighboring the guard cells when the guard cells are flaccid
Phloem sap moves by what is called a hydrostatic pressure (water pressure). Which of the following is correct
phloem movement is due to a high hydrostatic pressure at the source and a low hydrostatic pressure at the sink
n the process of an NH4 ion entering a plant root and ultimately traveling to the leaves through the xylem, which of the following is true?
the NH4 could move as far as the endodermis by apoplastic movement
to get past the endodermis, the NH4 would need to enter into the symplasm (the symplastic route)
Once across a cell plasma membrane, the NH4 could move through the symplasm all the way to the xylem
the Casperian strip is made of suberin and it prevents movement ions within the cell wall (apoplast route)
In the process of transpiration of water in plants, the most positive water potential would be in the
Which of the following is true about cation exchange in soil?
Cations on the exchange can be displaced and go into the soil solution and from there can be taken up by roots
An example of a macronutrient and its correct function would be:
S, important component of many proteins
Mycorrhizae are a:
mutualistic relationship between a plant and a fungus
Which of the following are true regarding nitrogen fixation or mychorrhizae?
Legumes supply energy to mycorrhizae, which in turn fix nitrogen and supply it to the plants
, Not Selected
By fertilizing a field, your plants would be less likely to enter into a relationship with N-fixing bacteria or mychorrhizae (what is the difference between and obligate vs facultative relationship-think aerobic and anaerobic)
, Not Selected
Endomychorrhizae typically have a mantle around the root
, Not Selected
Non-legume species like corn or maize do form a mutualistic relationship with nitrogen fixing bacteria like Rhizobium
, Not Selected
Ectomycorrhizae form arbuscles
The general half-reaction for nitrogen fixation is:
N2 -> NH3
A soil's cation exchange capacity can:
reduce leaching of cations from soil during a heavy rain
release cations into the soil solution that are then available for plants to absorb
be affected by factors like pH (also soil type, organic matter etc.)
Describe/list plant organs, plant tissues and plant cell types (both general and specific plant cell types)
Identify specific tissues and cell types within plant organs (root, stem, leaf XS sections)
Explain meristematic tissue and both primary and secondary growth.
Describe how organ or cell structure relates to function
Describe soil and where various essential nutrients come from within the soil
Explain the cation exchange complex (CEC) and why it is important
Contrast macro and micronutrients. Explain their functions and how the plant obtains them.
Explain the nitrogen cycle and major reactions within it. Explain nitrogen fixation
Describe mycorrhizae. Explain their relationship with plants and the advantages for each species.
Describe passive movement of molecules through diffusion or osmosis (water, semi-permeable membrane)
Describe the components of water potential and explain how total water potentials determine direction of water movement.
Determine the direction of water movement using the components of water potential.
Explain carriers and channels and how movement of molecules can be passive or active.
understand how stomata open and close and how fluid moves within the xylem and phloem.
Explain the mechanism of stomatal opening and closing.
Describe the process of pressure driven phloem movement
Explain the cohesion tension theory for movement of water in the xylem and how it is related to evaporation
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