AnswersTX-Biology B-CRUnit Test

Unit Test — Cumulative exam Answers

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1
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Which organ systems work together to help the body shiver in order to maintain homeostasis?

A
circulatory and respiratory
B
nervous and muscular
C
circulatory and muscular
D
respiratory and nervous
2
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Which of the following genetic symbols represents the sporophyte generation in the plant life cycle?

A
n
B
4n
C
2n
D
2n – 1
3

What will happen to the frequency of the recessive allele for the HbS gene when there is an outbreak of malaria?

A
The frequency will increase.
B
The frequency will decrease.
C
The frequency will remain constant.
D
It is impossible to predict how the allele frequency will change.
E
The frequency will be cut in half with each generation.
4

Which two statements correctly describe the life cycles of mosses and angiosperms?I. Both life cycles have protected seeds.II. Both life cycles involve meiosis.III. Moss fertilization occurs in the air; angiosperm fertilization occurs in a pool of water.IV. Mosses release haploid spores into the surrounding environment; angiosperms release haploid pollen grains into the surrounding environment.

A
I and III
B
I and IV
C
II and III
D
II and IV
5

Arianne recently traveled abroad where she enjoyed eating food from different countries and learning about different cultures. A week after she returned home, she checked into the hospital with signs of nausea, fever, and diarrhea. What best explains what happened to Arianne?

A
A parasitic bacteria contaminated her food.
B
A mutualistic bacteria infected her digestive system.
C
A commensalistic organism is now living in her intestine.
D
A predatorial organism is consuming her natural bacteria.
6

If a deer eats grass, what percentage of energy will the deer acquire from the grass?

A
0.1 percent
B
1 percent
C
10 percent
D
100 percent
7

Consider the terms egg, sperm, and sporophyte. Which term links egg and sperm directly to sporophyte?

A
meiosis
B
spore
C
fertilization
D
gametophyte
8

Maintaining a healthy lifestyle through diet and exercise is important,

A
but it has no effect on the immune system.
B
but it actually decreases the immune system.
C
but exercise is more important than diet for the immune system..
D
but no specific diet has been proven to boost the immune system.
9

A family released their pet fish family into a local pond. The fish had no known local population. The impact of the fish on the ecosystem is not yet known. Which term would best define the fish added to the pond?

A
invasive species
B
introduced species
C
native species
D
symbiotic species
10

sugarurinebloodsaliva

A
sugar
B
urine
C
blood
D
saliva
11

A relationship in which one organism benefits while the other is neither harmed nor helped is called

A
predation.
B
parasitism.
C
commensalism.
D
mutualism.
12

The Great Pacific Garbage Patch is an area in the North Pacific Ocean that contains trash and causes harm to ocean life and those that consume that life. What lessons can be learned from this floating pile of trash?

A
There is no relationship between our daily activities and the environment.
B
There are more polluters in the Pacific Ocean than in the Atlantic Ocean.
C
There are areas of the ocean to avoid with boats.
D
There is a relationship among all living things on Earth.
13

The body obtains sugar from food. Which system most directly affects blood sugar levels?

A
respiratory
B
muscular
C
circulatory
D
digestive
14

The haploid number of sphagnum moss is 19. What is its diploid number?

A
9.5
B
19
C
38
D
76
15

How will Richard’s body react when a friend jumps in front of him and scares him?

A
Richard’s central nervous system will take over, and his peripheral nervous system will play a lesser role.
B
Richard’s peripheral nervous system will take over, and his central nervous system will play a lesser role.
C
Richard’s sympathetic nervous system will take over, and his parasympathetic nervous system will play a lesser role.
D
Richard’s parasympathetic nervous system will take over, and his sympathetic nervous system will play a lesser role.
16

The brain and spinal cord work together so the body can receive signals and react to the environment. What is the spinal cord?

A
a cell
B
a tissue
C
an organ
D
an organ system
17

How is a brain injury classified?

A
as an injury of the peripheral nervous system
B
as an injury of the central nervous system
C
as an injury of the autonomic nervous system
D
as an injury of the somatic nervous system
18

Humans process some foods by adding chemicals to reduce harmful bacterial growth. This allows foods to be edible for longer periods of time. Which best describes the advantages of food processing?

A
control of density-independent limiting factors such as disease spread
B
control of density-dependent limiting factors such as disease spread
C
control of density-dependent limiting factors such as predation
D
control of density-independent limiting factors such as predation
19

Natural resources are classified as renewable and nonrenewable. What is the difference between the two?

A
whether or not the resource exists in nature
B
whether or not the resource can be replaced
C
whether or not the resource dwindles in supply
D
whether or not the resource is useful to humans
20

Cacti typically grow in very dry climates with infrequent rainfall. When it does rain, the rain usually only penetrates a few inches into the soil. Which adaptation is most likely to help a cactus survive in the dry climate?

A
thick xylem tissue to transport sugar
B
leaves that have a thin cuticle
C
extensive shallow roots that absorb water
D
more dermal tissue for food storage

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