7th Grade LEAP 2025 Science Review

What organelle contains your genes?

• DNA

• Genomes

• Proteins

• Alleles

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Where does the food chain begin?

• Insects

• The sun

• Mice

• Birds of prey

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The process of which plants intake energy from the sun and convert it to glucose (sugar)

• Solar conversion

• Energy intake

• Photosynthesis

• I don't know

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What are the stages of cell division (mitosis)?

• Prephase, Metaphase, Intraphase, Aphase, Telophase

• Interphase, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis

• Dualphase, Metaphase, Cellular Division, Cytokinesis, Prophase

• Before, during, and after

What is the main control center of cells?

• Nucleolus

• Nucleus

• Golgi Body

• Lysosomes

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Both primary and secondary succession begin with pioneer species that

• use up all the existing resources and prevent establishment of non-native organisms

• modify the area and allow larger and more complex organisms to appear

• change the area and make it safer from predatory organisms

• invade the area so that new organisms cannot be established

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Frederick is studying how ecological succession will change a freshly-plowed piece of land. Which data table represents what Frederick is most likely to record about the plant life in each stage of ecological succession?

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The picture shows where oranges are grown in the United States. Oranges require a very long growing season with mild to hot weather.What is the most likely reason many of the oranges are grown in California?

• There are more organisms that eat oranges in California than in any other states.

• California has a climate that creates a good environment for growing oranges.

• Oranges will only grow in states on the coast with environments near water.

• Oranges will only grow in sandy soil that few of the other states have.

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When an ecosystem contains many different species, there are usually a high number of links in its food web. How does this affect the sustainability of the ecosystem?

• Typically, if one link in the food web is removed, the ecosystem will no longer exist.

• Typically, if one link in the food web is added, the ecosystem will destabilize.

• Typically, if one link in the food web is removed, the ecosystem will remain stable.

• Typically, if one link in the food web is added, the ecosystem will change its location.

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An ecosystem's sustainability is most dependent on?

• warm temperatures.

• the amount of water there.

• having a large number of a single plant species.

• the number and variety of organisms that live there.

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