Science 8A

Unit 1

100

Which statement correctly defines ethics?

• a set of assumptions generally accepted as true
  
  
  
• a set of moral values 
• 
  
  
  
• a set of correct procedures
  
  
  
• a set of limits on which research options to pursue 

a set of moral values

200

Which option accurately describes why dowsing is a non-science?

• It is impossible to detect underground water from the surface.It is impossible to detect underground water from the surface. ,  ,
• Dowsing cannot find water all of the time.Dowsing cannot find water all of the time. ,  ,
• Dowsing practitioners refuse to explain their secrets.Dowsing practitioners refuse to explain their secrets. ,  ,
• The results cannot be reliably replicated by repeated experiments.

The results cannot be reliably replicated by repeated experiments.

300

Which statement correctly defines bar graph?

• a visual representation of data that uses unconnected plotted points 
• a visual representation of data ranges that contains bars that are next to each other instead of spaced apart
• a visual representation of data that uses rectangles of equal width to show relationships between sets of data
• a circular representation of data consisting of divided sections that make up the whole

a visual representation of data that uses rectangles of equal width to show relationships between sets of data

Unit 2

100

Which option provides the correct levels of organization for multicellular organisms from the smallest level to the largest?

• organ, cell, organ system, tissue
• cell, tissue, organ, organ system
• cell, organ, tissue, organ system
• organ, organ system, cell, tissue

cell, tissue, organ, organ system

200

Which option correctly identifies why the body is a system?

• It contains only tissues, and they only interact with each other.It contains only tissues, and they only interact with each other. ,  ,
• It contains only organ systems, and they do not interact with each other.It contains only organ systems, and they do not interact with each other. ,  ,
• It contains various organ systems that interact with each other.It contains various organ systems that interact with each other. ,  ,
• It contains various tissues that do not interact with each other. 

It contains various organ systems that interact with each other.

300

Which option correctly describes the nature of nerve signals?

• Nerve signals are electrical. They move along nerve cells from the point of contact to the spinal cord and then to the heart.Nerve signals are electrical. They move along nerve cells from the point of contact to the spinal cord and then to the heart. ,  ,
• Nerve signals are mechanical. They move along nerve cells from the point of contact to the spinal cord and then to the brain.Nerve signals are mechanical. They move along nerve cells from the point of contact to the spinal cord and then to the brain. ,  ,
• Nerve signals are mechanical. They move along nerve cells from the point of contact to the spinal cord and then to the heart.Nerve signals are mechanical. They move along nerve cells from the point of contact to the spinal cord and then to the heart. ,  ,
• Nerve signals are electrical. They move along nerve cells from the point of contact to the spinal cord and then to the brain.Nerve signals are electrical. They move along nerve cells from the point of contact to the spinal cord and then to the brain. ,  ,

Nerve signals are electrical. They move along nerve cells from the point of contact to the spinal cord and then to the brain.

Unit 3

100

Which observation led Mendel to the idea that traits were controlled by more than a single factor?

• A trait that was not seen in the first generation may later reappear in the second generation.A trait that was not seen in the first generation may later reappear in the second generation. ,  ,
• Crossing two short pea plants always resulted in a short pea plant.Crossing two short pea plants always resulted in a short pea plant. ,  ,
• Crossing two tall pea plants always resulted in a tall pea plant.Crossing two tall pea plants always resulted in a tall pea plant. ,  ,
• A trait that was not seen in the first generation was completely gone and never reappeared.

A trait that was not seen in the first generation may later reappear in the second generation.

200

Which term is defined as a genotype composed of two identical alleles?

haploid

heterozygous

diploid

homozygous

homozygous

300

Which statement defines genotype?

how an organism looks from the outside, as determined by its traits

an organism’s dominant allele, which masks the effects of the other

an organism’s genetic makeup, as determined by alleles

how an organism looks from the outside, as determined by its alleles

an organism’s genetic makeup, as determined by alleles

Unit 4

100

Which statement defines fitness?

• an organism’s ability to eat large amounts of foodan organism’s ability to eat large amounts of food ,  ,
• an organism’s ability to pass on its alleles to the next generationan organism’s ability to pass on its alleles to the next generation ,  ,
• an organism’s ability to find good food sources in this generationan organism’s ability to find good food sources in this generation ,  ,
• an organism’s ability to run long distances

an organism’s ability to pass on its alleles to the next generation

200

Which option describes how adaptations spread throughout a population?

• The individuals with the adaptation can teach the adaptation to other members of the population. The entire population will have the adaptation over time.The individuals with the adaptation can teach the adaptation to other members of the population. The entire population will have the adaptation over time. ,  ,
• The individuals with the adaptation become good enough at evading or fighting that their predators choose to leave the whole species alone.The individuals with the adaptation become good enough at evading or fighting that their predators choose to leave the whole species alone. ,  ,
• The individuals with the adaptation have an advantage in fitness. Those individuals are more likely to reproduce and pass on their genes.The individuals with the adaptation have an advantage in fitness. Those individuals are more likely to reproduce and pass on their genes. ,  ,
• The individuals with the adaptation have a chance to practice their adaption, and they gradually become better and better at it. 

The individuals with the adaptation have an advantage in fitness. Those individuals are more likely to reproduce and pass on their genes.

300

Which statement defines evolution?

• the change in non-heritable traits that occurs in populations over timethe change in non-heritable traits that occurs in populations over time ,  ,
• the changes in the physical environment that a species lives in that occur over timethe changes in the physical environment that a species lives in that occur over time ,  ,
• the change in heritable traits that occurs in populations over timethe change in heritable traits that occurs in populations over time ,  ,
• the changes in the physical environment that a species lives in that occur after a sudden change

the change in heritable traits that occurs in populations over time