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Grade 7 Life Science Final Exam
1.

Which of the following is responsible for controlling most of the cell's activities and contains the genetic material?

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2.

Which organelle is often called the 'powerhouse of the cell' because it produces energy through cellular respiration?

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3.

What is the main difference between a plant cell and an animal cell?

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4.

The jelly-like substance that fills the cell and surrounds the organelles is called the:

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5.

Which of the following describes a prokaryotic cell?

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6.

A specific characteristic that an organism can pass to its offspring is called a:

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7.

An allele that always shows up in the phenotype if it is present is described as:

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8.

If 'B' represents the allele for brown eyes (dominant) and 'b' represents the allele for blue eyes (recessive), which genotype would result in blue eyes?

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9.

The observable traits of an organism, such as hair color or eye color, represent its:

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10.

What is a major advantage of sexual reproduction over asexual reproduction?

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11.

The process by which organisms that are better adapted to their environment tend to survive and produce more offspring is known as:

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12.

A characteristic that helps an organism survive and reproduce in its environment is called an:

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13.

Which of the following provides evidence for evolution?

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14.

If an environment changes rapidly, which population is most likely to survive?

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15.

The disappearance of all members of a species from Earth is called:

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16.

An organism that makes its own food using sunlight is called a:

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17.

Which of the following is an example of an abiotic factor in an ecosystem?

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18.

A community of organisms and their non-living environment is called a(n):

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19.

In a food chain, what do arrows represent?

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20.

Organisms that break down dead organic matter and return nutrients to the soil are called:

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21.

Which body system is responsible for breaking down food into nutrients the body can absorb?

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22.

The heart, blood vessels, and blood are all parts of which human body system?

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23.

What is the primary function of the respiratory system?

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24.

Which system allows you to respond to stimuli and controls your body's functions through electrical signals?

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25.

Bones provide structure and protection for the body. Which system are they a part of?

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26.

Describe the primary function of a microscope in the study of living organisms and cells.

Population Changes of Species A and Species B
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        <text x="30" y="120" font-size="12" text-anchor="middle" transform="rotate(-90 30 120)">Population Size</text>
        <text x="45" y="220" font-size="10" text-anchor="end">0</text>
        <text x="45" y="170" font-size="10" text-anchor="end">20</text>
        <text x="45" y="120" font-size="10" text-anchor="end">40</text>
        <text x="45" y="70" font-size="10" text-anchor="end">60</text>
        <text x="45" y="20" font-size="10" text-anchor="end">80</text>
        <line x1="50" y1="220" x2="350" y2="220" stroke="black"/>
        <text x="200" y="235" font-size="12" text-anchor="middle">Year</text>
        <text x="75" y="230" font-size="10" text-anchor="middle">2010</text>
        <text x="125" y="230" font-size="10" text-anchor="middle">2012</text>
        <text x="175" y="230" font-size="10" text-anchor="middle">2014</text>
        <text x="225" y="230" font-size="10" text-anchor="middle">2016</text>
        <text x="275" y="230" font-size="10" text-anchor="middle">2018</text>
        <text x="325" y="230" font-size="10" text-anchor="middle">2020</text>
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        <circle cx="175" cy="70" r="3" fill="blue"/>
        <circle cx="225" cy="45" r="3" fill="blue"/>
        <circle cx="275" cy="30" r="3" fill="blue"/>
        <circle cx="325" cy="25" r="3" fill="blue"/>
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        <rect x="122" y="132" width="6" height="6" fill="red"/>
        <rect x="172" y="117" width="6" height="6" fill="red"/>
        <rect x="222" y="102" width="6" height="6" fill="red"/>
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        <text x="305" y="55" font-size="10">Species A</text>
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        <text x="305" y="70" font-size="10">Species B</text>
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27.

Based on the graph, describe the general trend of the population size for Species A and Species B between 2010 and 2020. Which species appears to be more successful in this environment during this period? Justify your answer.

28.

A plant species has two alleles for flower color: Red (R) is dominant, and white (r) is recessive. If a homozygous dominant red-flowered plant (RR) is crossed with a white-flowered plant (rr), what percentage of the offspring would you expect to have red flowers? Explain your reasoning.

29.

Explain the difference between a producer and a consumer in an ecosystem. Provide an example of each.

30.

Describe how the skeletal system and muscular system work together to allow a person to bend their arm at the elbow.

31.

Compare and contrast the functions of the cell wall and the cell membrane in a plant cell. Include at least two similarities and two differences.

32.

Explain the process of natural selection as described by Charles Darwin. In your explanation, include the concepts of variation, overproduction, competition, and adaptation, and how they lead to changes in a population over time.

33.

Discuss the potential negative impacts of introducing an invasive species into a native ecosystem. Provide at least two specific examples of how such an introduction can disrupt the ecosystem's balance.

34.

Explain how the respiratory system and the circulatory system work together to ensure that the body's cells receive the oxygen they need and get rid of waste carbon dioxide. Describe the path of oxygen and carbon dioxide through these two systems.

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