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Science REVIEW 7th grade


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19 questions
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  • Q1

    Which of the following describes a stage in ecological succession that results in the most stable community?

    A meadow replaces a bog.

    A bog replaces a lake.

    A thin layer of soil covers an area that was once covered by bare rock.

    A deciduous forest replaces a meadow.

  • Q2

    A student drew the picture of a human body system shown below. The student labeled some of the organs of the system. The main function of this human body system is to —

    Question Image

    exchange gases with the environment

    chew food as it enters the mouth

    trap particles that enter the nose

    sense odors in the environment

  • Q3

    A student examines the winged insect shown. Based on the dichotomous key, in what order should this insect be classified? (Hint: A prothorax is after the head, where the neck would be in a human)

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  • Q4

    Three cousins have a similar appearance but different face shapes. Which of these cell components are most involved in determining the basic shape of each girl’s face?

    Cytoplasm, chloroplasts, and genes

    Chromosomes, chloroplasts, and vacuoles

    Genes, chromosomes, and nucleus

    vacuoles, nucleus, and chromosomes

  • Q5

    According to the key, this plant is a — 

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  • Q6

    On the Galapagos Islands, Charles Darwin observed that different species of finches had beaks of different shapes that were specialized for the types of food they ate. Which of these finches would most likely be able to pick up and crack open hard seeds for use as food?

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    Finch 4

    Finch 3

    Finch 2

    Finch 1

  • Q7

    A population of plants in a meadow ranges in height from 4 cm to 14 cm. The taller plants block sunlight from reaching the shorter plants. Grazing animals prefer the taller plants. Use the concept of natural selection to predict what will eventually happen to the plants.

    They will be above 14 cm in height.

    They will be about 6 cm to 10 cm in height.

    They will be under 4 cm in height.

    They will be about 4 cm in height.

  • Q8

    The table shows average daily milk production for several cows. A farmer wants to increase her rates of milk production. Which cow should she selectively breed?

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    Cow C

    Cow A

    Cow D

    Cow B

  • Q9

    What is one way that your body maintains its internal environment on a hot day?

    Your temperature decreases to prevent you from overheating.

    Your brain sends a signal that results in your feeling hungry.

    Your muscles contract to cause shivering.

    Your body produces more sweat.

  • Q10

    What is the function of the body system shown in the picture?

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    moves blood to all body tissues

    sends chemical signals throughout the body

    removes wastes from the blood

    breaks food into chemicals that the body can use

  • Q11

    What plant structure is responsible for converting sunlight into chemical energy?





  • Q12

    Plant cells are different from animal cells because plant cells have — 

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    cell wall


  • Q13

    Which of the following statements is part of the cell theory?

    All living things are made of one or more cells.

    All cells get their energy from sunlight.

    Humans are made of cells.

    All cells are surrounded by a cell wall.

  • Q14

    Which best describes an advantage of sexual reproduction over asexual reproduction?

    Sexual reproduction increases the genetic variability in a population.

    Sexual reproduction creates uniformity in the gene pool.

    Sexual reproduction produces many more offspring.

    Sexual reproduction increases the distribution of a population.

  • Q15

    Different organisms reproduce in different ways. Of the following, the form of reproduction that will result in the most genetically diverse offspring is —

    growth of a new strawberry plant from a runner

    budding in hydra

    cell division in bacteria

    formation of seeds by a pine tree after pollination


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