Plants Flashcards
Monocots differ from dicots in all of the following ways EXCEPT:
A. Flower parts in multiples of fours or fives rather than threes.
B. Leaves with parallel veins rather than branching venation.
C. Usually no secondary growth.
D. Stem with scattered vascular bundles rather than bundles in a ring.
A. Flower parts in multiples of fours or fives rather than threes.
Which of the following is incorrectly paired with its function?
A. Adventitious roots - branching root system found in monocots
B. Tap root - large vertical root found in dicots
C. Root hairs - absorption of water and dissolved minerals
D. Root cap - protect root as it pushes through soil
A. Adventitious roots - branching root system found in monocots
Perennials differ from annuals in that they
A. Have secondary growth and are woody.
B. Persist through many growing seasons.
C. Have indeterminate growth.
D. All of the above are correct.
B. Persist through many growing seasons.
The function of stomata is to
A. Allow transport of water vapor into the leaf.
B. Allow transport of sugars out of the leaf.
C. Allow gas exchange between leaf and the atmosphere.
D. Open and close the guard cells.
C. Allow gas exchange between leaf and the atmosphere.
Lateral meristems
A. Are responsible for secondary growth.
B. Usually are not present in dicots.
C. Produce protoderm, procambium, and ground meristem tissues
D. Produce branch roots and lateral buds.
A. Are responsible for secondary growth.
Proton pumps in the plasma membranes of plant cells may
A. generate a membrane potential that helps drive charged minerals into the cell through their specific carriers.
B. be coupled to the movement of K+ into guard cells
C. indirectly drive the accumulation of sucrose in sieve-tube members
D. be involved in all of the above
D. be involved in all of the above
The Casparian strip prevents water and minerals from entering the stele through the:
A. plasmodesmata
B. endodermal cells
C. symplast
D. apoplast
D. apoplast
Which of these is not a major factor in the movement of xylem sap?
A. transppiration
B. active transport using a proton pump
C. adhesion
D. cohesion
B. active transport using a proton pump
Adhesion is a result of:
A. hydrogen bonding between water molecules
B. the pull on the water column as water evaporates from the surface of mesophyll cells
C. tension within the xylem caused by a lowered water potential
D. attraction of water molecules to hydrophilic walls of narrow xylem tubes
D. attraction of water molecules to hydrophilic walls of narrow xylem tubes
Which of these is not a factor in the opening of stomata?
A. a decrease in the turgor of guard cells
B. depletion of CO2 in the air spaces of the leaf
C. stimulation of proton pumps that result in the movement of K+ into the guard cells
D. circadian rhythm of guard-cell opening
A. a decrease in the turgor of guard cells
Phloem sap moves:
A. from a sugar source to a sugar sink
B. primarily through the symplast
C. by a pressure-flow mechanism
D. all of the above are correct
D. all of the above are correct
The inorganic compound that contributes most of the mass to a plant’s organic matter is
A. H2O
B. CO2
C. NO3
D. O2
B. CO2
The most fertile type of soil is
A. sand because its large particles allow room for air spaces
B. loam which has a mixture of fine and coarse particles
C. clay because the fine particles provide much surface area to which minerals and water adhere.
D. topsoil - a mixture of decomposed rock, living organisms, and humus
B. loam which has a mixture of fine and coarse particles
Nitrogenase
A. is an enzyme that reduces atmospheric nitrogen to ammonia
B. is found in Rhizobium and other nitrogen-fixing bacteria
C. is inhibited by high concentrations of oxygen
D. is all of the above
D. is all of the above
Epiphytes
A. have haustoria for anchoring to their host plants
B. are symbiotic relationships between roots and fungi
C. live in poor soil and digest insects to obtain nitrogen
D. grow on other plants but do not obtain nutrients from their hosts
D. grow on other plants but do not obtain nutrients from their hosts
