2nd Semester Exam Review 7th Grade Life Science

During photosynthesis, plant cells use sunlight as an energy source. Animal cells do not use photosynthesis. What organelle in plant cells makes it possible for plants to carry out photosynthesis?

• cell wall

• chloroplast

• lysosome

• nucleus

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Which of the following is an organism?

• DNA

• nucleus

• cytoplasm

• prokaryote

What is natural selection?

• The process by which humans breed a species for certain traits

• The process in which inherited traits of a population change over many generations

• The process by which Charles Darwin noted the differences in finches while visiting the Galápagos Islands

• The process by which individuals that are better adapted to their environment are more likely to survive and reproduce

Which of the following is an example of a species?

• birds

• birds of prey

• owls

• spotted owl

What is evolution?

• A group of organisms that can mate to produce fertile offspring

• The process in which inherited traits of a population change over many generations

• The process by which individuals that are better adapted to their environment are more likely to survive and reproduce

• A trait that allows organisms in a population to better survive and reproduce in their environment

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Which of these claims best describes what Charles Darwin observed on the Galápagos Islands?

• The finches on the islands ate seeds and nuts but no insects.

• The finches on the islands were the same as the finches in Ecuador.

• The finch population on each island was unique.

• The finches could produce offspring only with finches from other islands.

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While exploring a rock formation, Hiroto finds a rock that has footprints pressed into it. A geologist tells Hiroto that the rock is millions of years old. Which of these claims is correct about

Hiroto’s find?

• It is not a fossil, because footprints are not fossils.

• It is not a fossil, because only whole organisms are fossils.

• It is a fossil only if Hiroto finds actual parts of the organism in rocks nearby.

• It is a fossil because footprints of organisms from million of years ago are considered to be fossils.

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Polar bears live in the Arctic. Ice in the Arctic is melting rapidly, reducing the range in which the polar bear can live. If polar bears do not have adaptations that allow them to survive these changes, what may happen to the polar bear?

• They may overpopulate.

• They may become extinct

• They may change the environment.

• They may become another species.

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9. At the zoo, Anya observes that individuals of a certain kangaroo species have slightly different sizes and colors. What characteristic of populations is Anya observing?

• adaptation

• evolution

• selection

• variation

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Which claim correctly describes a type of cell division?

• Mitosis involves one cell division that produces four cells.

• Meiosis involves one cell division that produces two cells.

• Mitosis involves two cell divisions that produce two cells.

• Meiosis involves two cell divisions that produce four.

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