Bio 191 UNLV exam 2 study guide Latest Update 2024-2025 Exam 150 Questions and 100% Verified Correct Answers Guaranteed A+
A turgid cell is what? - CORRECT ANSWER: Stiff
According to the pressure-flow hypothesis, sugars flow from places where sugars are made to sites where sugars are utilized, by means of differences in? - CORRECT
ANSWER: Turgor pressure
Apoplast definition - CORRECT ANSWER: Water filled cell walls and intercellular
species
Arrange the soil layers in order. Start with the uppermost layer on top and end with the
lowermost at the bottom. - CORRECT ANSWER: Topsoil, subsoil, soil base, bedrock
As water percolates through the soil, minerals are carries away in a process called? -
CORRECT ANSWER: Leaching
By what actions can fixed nitrogen be added to soils? - CORRECT ANSWER: air
pollution, lightning, fire
Carbon dioxide enters plants through pores in their leaves called - CORRECT
ANSWER: stomata
During this type of transport, substances remain outside the cytosol of cells -
CORRECT ANSWER: apoplastic
Facilitated diffusion - CORRECT ANSWER: The transport of molecules across a
membrane with the aid of transport proteins.
Flowering plants can be heterotrophic. True or False - CORRECT ANSWER: True
Green plants extract __ energy from the sun, while animals extracts __ energy from
organic compounds. - CORRECT ANSWER: light energy, chemical energy
In contrast to xylem, sieve-tube elements in the phloem must be alive to ? - CORRECT
ANSWER: generate the pressure differences required for bulk flow.
In nitrogen fixation nitrogen gas is converted into? - CORRECT ANSWER: ammonia
In order to take up cations from the soil, plants may secrete? - CORRECT ANSWER: acidic compounds
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In plants chemical energy for metabolism comes from organic molecules that are -
CORRECT ANSWER: synthesized using light energy
In plants water moves from a solution that has a __, solute concentration(soil) to one of
a __ , solute concentration (root cells) - CORRECT ANSWER: low, high
In which environmental conditions is water stress common? - CORRECT ANSWER:
windy, arid and freezing
Leaf abscission reduced the amount of __ mass that plants must produce to obtain
water under arid conditions. - CORRECT ANSWER: Root
Loam soil contains a mixture of? - CORRECT ANSWER: sand, silt, and clay
Long- distance transport of water and minerals through a plant due to the pull of
transpiration is explained by the - CORRECT ANSWER: cohesion tension theory
Match the cell type with the solution in which it is found- - CORRECT ANSWER: Turgid- hypotonic, Plasmolyzed-Hypertonic, Flaccid-Isotonic
On a walk through a forest, you come across a small, white plant you recall as Indian Pipe. Since it is white you determine that it has no chlorophyll. How does it obtain
energy? - CORRECT ANSWER: From organic compounds obtained from other
organisms.
Osmosis depends on which of the following two factors? - CORRECT ANSWER: Solute
content and turgor pressure
Passive diffusion - CORRECT ANSWER: The transport of molecules across a
membrane without the aid of transport proteins.
Phloem loading exists in these two types: - CORRECT ANSWER: symplastic-does not require ATP. sugar moves through plasmodesmata and does not close plasma membranes.Partially apoplastic- does require ATP. sugar is loaded into sieve- tube elements or companion cells from intercellular spaces. Also a transmembrane protein.
Plant roots often secrete organic acids that help to detach cations from clay particles. -
CORRECT ANSWER: Plant roots often secrete organic acids that help to detach
cations from clay particles.
Plants avoid low leaf water potentials by dropping their leaves under what conditions? -
CORRECT ANSWER: Drought
Plants can reduce transpirational water loss through what? - CORRECT ANSWER:
control of stomata opening and closing as well as leaf drop.
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