BIOLOGY 109 EXAM #2 REVIEW
QUESTIONS WITH COMPLETE ANSWERS
Salmon return to fresh-water streams to spawn, producing thousands of eggs in a single
opportunity before they die. This type of life history event is an example of - ANSWER-Big-
bang reproduction and semelparity
As N approaches K for a certain population, which of the following is predicted by the
logistic equation? - ANSWER-The growth rate will approach zero
Which of the following scenarios is consistent with the concept of K-Selection? -
ANSWER-Great frigatebirgds competing for nesting sites on the Galapagos Islands
Exponential growth of a population is represented by dN/dt = - ANSWER-rN
Which of the following is NOT a density-dependent factor that can impact population
growth? - ANSWER-Climate
Which of the following graphs refer to the equation? dN/dt = 0.5N - ANSWER-J,
exponential growth
The sum total of an organism's interaction with the biotic and abiotic resources of its
environment is called its - ANSWER-ecological niche
Which of the following statements is consistent with the principle of competitive exclusion?
- ANSWER-Even a slight reproductive advantage will eventually lead to the elimination of
the less well adapted of two competing species
Which of the following best describes resource partitioning? - ANSWER-Slight variations
in niche allow similar species to coexist
As you study two closely related predatory insect species, the two-spot and the three-spot
avenger beetles, you notice that each species seeks prey at dawn in areas without the
other species. However, where their ranges overlap the two-spot avenger beetle hunts at
night and the three-spot hunts in the morning. When you bring them into the laboratory,
their offspring behave in the same manner. You have discovered an example of -
ANSWER-Character displacement
Which of the following is an example of Mullerian mimicry? - ANSWER-Two species of
unpalatable butterfly that have the same color pattern
Based on the ABC model, what would be the structure of a flower that had normal
expression of genes A and B but lacked expression of gene C? - ANSWER-Sepal-petal-
petal-sepal
Suppose George Washington completely removed the bark from around the base of a
cherry tree but was stopped by his father before cutting the tree down. The leaves
, retained their normal appearance for several weeks, but the tree eventually died. The
tissue that George left functional was the - ANSWER-Xylem
This root structure ensures that all water and dissolved substances must pass through a
cell membrane before entering the stele (vascular cylinder) - ANSWER-Casparian strip
Photosynthesis ceases when leaves wilt, mainly becuase - ANSWER-Stomata closes,
preventing CO2 from entering the leaf
If _P = 0.3 MPa and _S = -0.45 MPa, the resulting _ is - ANSWER--0.15 MPa
What regulates the flow of water through the xylem? - ANSWER-The evaporation of water
from the leaves
The early morning sun stimulates stomata to open by - ANSWER-Stimulating the activity
of proton pumps in the plasma membrane of guard cells
Molecules are transported within a plant from root hair to vascular cylinder utilizing free
spaces and cell walls. Which route is utilized by this molecule for transport? - ANSWER-
Apoplastic Route
The value for _ in flaccid leaf cells is -0.7 MPa. If you take the leaf tissue and place it in a
0.4 M solution of sucrose (_=-0.9), net flow water flow would lead to - ANSWER-
Plasmolysis
In leaf sieve-tube elements, the concentration of sucrose is significantly greater than in the
surrounding mesophyll cells. The mechanism responsible for this difference is - ANSWER-
An H+ gradient generated by proton pumps in companion cells and sieve-tube elements
The mature embryo sac (female gametophyte) contains - ANSWER-3 antipodal cells, 2
polar nuclei, 2 synergids and 1 egg cell
In the alternation of generations in plants the formation of gametes from sporophytes
requires which processes to have occured - ANSWER-Meiosis and mitosis
A fruit that develops from many separate carpels from one flower - ANSWER-aggregate
fruit
Ensures that endosperm will develop only in ovules where eggs have been fertilized -
ANSWER-double fertilization
A long cellular protuberance that delivers sperm to the female gametophyte - ANSWER-
pollen tube
A food-storing tissue of the seed - ANSWER-endosperm
Mayflies swarm in great numbers to increase their chances of mating. This behavior
exemplifies which type of dispersion? - ANSWER-Clumped
QUESTIONS WITH COMPLETE ANSWERS
Salmon return to fresh-water streams to spawn, producing thousands of eggs in a single
opportunity before they die. This type of life history event is an example of - ANSWER-Big-
bang reproduction and semelparity
As N approaches K for a certain population, which of the following is predicted by the
logistic equation? - ANSWER-The growth rate will approach zero
Which of the following scenarios is consistent with the concept of K-Selection? -
ANSWER-Great frigatebirgds competing for nesting sites on the Galapagos Islands
Exponential growth of a population is represented by dN/dt = - ANSWER-rN
Which of the following is NOT a density-dependent factor that can impact population
growth? - ANSWER-Climate
Which of the following graphs refer to the equation? dN/dt = 0.5N - ANSWER-J,
exponential growth
The sum total of an organism's interaction with the biotic and abiotic resources of its
environment is called its - ANSWER-ecological niche
Which of the following statements is consistent with the principle of competitive exclusion?
- ANSWER-Even a slight reproductive advantage will eventually lead to the elimination of
the less well adapted of two competing species
Which of the following best describes resource partitioning? - ANSWER-Slight variations
in niche allow similar species to coexist
As you study two closely related predatory insect species, the two-spot and the three-spot
avenger beetles, you notice that each species seeks prey at dawn in areas without the
other species. However, where their ranges overlap the two-spot avenger beetle hunts at
night and the three-spot hunts in the morning. When you bring them into the laboratory,
their offspring behave in the same manner. You have discovered an example of -
ANSWER-Character displacement
Which of the following is an example of Mullerian mimicry? - ANSWER-Two species of
unpalatable butterfly that have the same color pattern
Based on the ABC model, what would be the structure of a flower that had normal
expression of genes A and B but lacked expression of gene C? - ANSWER-Sepal-petal-
petal-sepal
Suppose George Washington completely removed the bark from around the base of a
cherry tree but was stopped by his father before cutting the tree down. The leaves
, retained their normal appearance for several weeks, but the tree eventually died. The
tissue that George left functional was the - ANSWER-Xylem
This root structure ensures that all water and dissolved substances must pass through a
cell membrane before entering the stele (vascular cylinder) - ANSWER-Casparian strip
Photosynthesis ceases when leaves wilt, mainly becuase - ANSWER-Stomata closes,
preventing CO2 from entering the leaf
If _P = 0.3 MPa and _S = -0.45 MPa, the resulting _ is - ANSWER--0.15 MPa
What regulates the flow of water through the xylem? - ANSWER-The evaporation of water
from the leaves
The early morning sun stimulates stomata to open by - ANSWER-Stimulating the activity
of proton pumps in the plasma membrane of guard cells
Molecules are transported within a plant from root hair to vascular cylinder utilizing free
spaces and cell walls. Which route is utilized by this molecule for transport? - ANSWER-
Apoplastic Route
The value for _ in flaccid leaf cells is -0.7 MPa. If you take the leaf tissue and place it in a
0.4 M solution of sucrose (_=-0.9), net flow water flow would lead to - ANSWER-
Plasmolysis
In leaf sieve-tube elements, the concentration of sucrose is significantly greater than in the
surrounding mesophyll cells. The mechanism responsible for this difference is - ANSWER-
An H+ gradient generated by proton pumps in companion cells and sieve-tube elements
The mature embryo sac (female gametophyte) contains - ANSWER-3 antipodal cells, 2
polar nuclei, 2 synergids and 1 egg cell
In the alternation of generations in plants the formation of gametes from sporophytes
requires which processes to have occured - ANSWER-Meiosis and mitosis
A fruit that develops from many separate carpels from one flower - ANSWER-aggregate
fruit
Ensures that endosperm will develop only in ovules where eggs have been fertilized -
ANSWER-double fertilization
A long cellular protuberance that delivers sperm to the female gametophyte - ANSWER-
pollen tube
A food-storing tissue of the seed - ANSWER-endosperm
Mayflies swarm in great numbers to increase their chances of mating. This behavior
exemplifies which type of dispersion? - ANSWER-Clumped
