BIO 1120 EXAM 2, Biology- Exam #2 review
Which of the following periods occurred during the Paleozoic era?
Silurian period
Which period would hold the record of the oldest fossils of multicellular animals, found in mountainous areas of South Australia, and parts of Canada and China?
Ediacarian
Refer to the accompanying figure. How would the survivorship curve for elephants be represented?
The curve c ( which is at the very top)
The mass extinction at the end of the Cretaceous period was likely the result of:
a dramatic change in climate.
Which set of values would result in a population with a growth rate of zero?
b = 1000, d = 500, i = 500, e = 1000
At zero population growth:
b = d
Based on the accompanying figure, which of the following age intervals has the highest death rate?
0-1
Amphibians evolved directly from which ancestral organisms?
Fishes
Which of the following is NOT a condition that is likely to lead to uniform population dispersion?
Pressure from predation
This period was characterized by the decline of some woody plants and the rise of herbaceous plants?
Quaternary period
Which period of Earth represents when evolution was progressing at the most rapid rate, as evidenced by fossils such as those of the Burgess Shale?
Cambrian period
Natural selection acts most directly on:
populations
At what date were gymnosperms, large dinosaurs, and the first toothed birds common?
201 mya
Which of the following consists of organisms, all of which share a common gene pool?
A population
Refer to the accompanying figure. A population that produces a large number of offspring, but the offspring must survive independently, would be represented by the curve labeled:
A./ in this pic it would be III
Which type of organisms were likely the first land animals?
Arthropods
Refer to the accompanying figure. At which point do the environmental limits begin to slow the growth rate?
C ( it wont let me upload the pic )
Mammal-like reptiles arose during which period?
Carboniferous period
Which statement about dinosaurs is FALSE?
Dinosaurs were all slow-moving, with relatively low metabolic rates.
Which is the largest division of the geologic time scale?
Eon
An example of a density-independent factor is predation
False
Most insects and invertebrates are said to be iteroparous.
False
Oysters have a(n) Type-II survivorship curve.
False
During the Pleistocene epoch, plant communities changed dynamically in response to which mechanism?
Fluctuating climates
What is the animal in the accompanying figure?
Ichthyosaur
Trees are often long-lived, strongly competitive, produce thousands of offspring, and disperse their offspring widely. Trees are therefore often best described as having traits that are characteristic of which of the following:
K-strategists
Human ancestors appeared in Africa during the Late_____________ and Early Pliocene epochs.
Miocene
During which period did shallow seas cover much of the land and another burst of evolutionary diversification occur?
Ordovician period
What feature of a dinosaur determines whether it is a saurischian or an ornithischian dinosaur?
Pelvic bone structure
What was the dominant life form of the Mesozoic era?
Reptiles
Vascular plants and air-breathing animals first appeared during which time period?
Silurian period
Describe the distinguishing organisms and major biological events associated with the following geological time units. A. Paleozoic era B. Cenozoic era
The Paleozoic era consisted of six periods. Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian. During this era, evolution was rapid and there was an appearance of many animal body plans. The oxygen enrichment hypothesis. Land was covered by seas. Jawed fish, terrestrial plants and air breathing animals had appeared. The age of fishes was born. Many amphibians and reptiles appeared also. It is also associated with the largest extinction event. During the Cenozoic era (the era of mammals, birds, insects and flowering plants) explosive radiation of birds and flowering plants continued to adapt and diversify.
Why is there very little physical evidence of life from rocks of the Archaean eon?
Those rocks have been deeply buried in most parts of the world.
The graph in the accompanying figure would best be described as:
being a J-shaped curve characteristic of exponential growth.
According to the data in the accompanying figure, the cause of the decline of the wolf population in 1982 was:
cannot be determined from the data provided
Based on the accompanying figure, the decline in the moose population in 1996 was most likely due to a(n):
decline in food supply
An exponential growth curve levels off at the carrying capacity.
false
Territoriality often results in clumped dispersion.
false
The potential capacity to produce offspring is called:
fecundity.
The Holocene epoch marks the appearance of?
humans
Eons are the largest divisions of the geologic timescale.
true
The largest population that can be maintained in an environment for an indefinite period of time is called the carrying capacity.
true