Answers25-26 Biology BCumulative Exam

Cumulative Exam — Cumulative exam Answers

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The figures below refer to a herd of water buffalo.Birth rate = 35 Death rate = 7Immigration = 4 Emigration = 17What is this population growth?

A
population increases by 41
B
population decreases by 15
C
population increases by 15
D
population decreases by 24
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A forest fire destroys an area. A small population of trees and a large population of birds are both affected. Which type of limiting factor causes this?

A
density dependent
B
density independent
C
population dependent
D
population independent
43

Which is a requirement for natural selection to occur?

A
heritable variations for some traits
B
the ability of an organism to improve a trait during its lifetime
C
equal probability of survival for all offspring
D
fewer offspring than the environment can support
44

A Russian citizen has illegally obtained a Siberian tiger and is trying to sell the tiger’s fur in the United States. What treaty does this violate?

A
Tiger Treaty
B
Lacey Treaty
C
CITES
D
EPA
45

Sophie says dolphins and sharks look very similar, so they must be related. Jake disagrees, saying DNA evidence has shown that dolphins and other aquatic mammals are actually more closely related to the ancestors of modern hippos. Who is correct using the modern system of classification?

A
Sophie is correct because dolphins look more like sharks than like hippos.
B
Jake is correct because classification is based on evolutionary relationships.
C
Both are correct because traditional and modern classifications can overlap.
D
Neither is correct because neither is taking into account both the traditional and modern systems
46

A biologist counts the number of zebras in a population each year, and notices an increase in the zebra population. Which describes the biologist’s actions?

A
graphing
B
inference
C
observation
D
interacting
47

Why are mushrooms important to the food chain?

A
They recycle nutrients into the ecosystem.
B
They produce food energy for other living things.
C
They recycle oxygen into the atmosphere.
D
They consume excess herbivores in the ecosystem.
48

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. There has been much debate about the classification of these creatures. Some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards. The data equally support both cases.Which statement best explains how to draw a cladogram that includes the rynchosaur?

Question illustration
A
Draw the cladogram for amphibians.
B
Draw the cladogram for reptiles.
C
Draw two cladograms, both showing the traits, and leave it as a hypothesis.
D
Draw two cladograms, both showing the traits, and have scientists vote.
49

Which best describes the exocrine glands?

A
Exocrine glands function only for digestion and temperature regulation.
B
Exocrine glands can sometimes release substances out of the body.
C
Exocrine glands secrete substances into the bloodstream.
D
Exocrine glands are only found in the skin and mouth.
50

Which of the following statements best describes scientific research?

A
Research typically uses one source.
B
Research typically uses a variety of sources.
C
Research is all done by doctors.
D
Research is all done in a laboratory.

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