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Science 7 · Unit 4: Grouping and identifying organisms · Cambridge Lower Secondary Science Stage 7

4.4 Using keys

17 questions · e.g. Use the key to name the fish

Practice

Questions

  1. 1. What is a key used for?

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  2. 2. Why does a key give two choices at each step?

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  3. 📖 This question is about a text that students read in the app.

    3. Use the fruit key. Fruit A has no wings. What is fruit A?

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  4. 📖 This question is about a text that students read in the app.

    4. Use the fruit key. Fruit B has two wings, and the angle between them is more than 45°. What is fruit B?

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  5. 📖 This question is about a text that students read in the app.

    5. Use the fruit key. Fruit C has two wings, but the angle between them is less than 45°. What is fruit C?

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  6. 📖 This question is about a text that students read in the app.

    6. Use the fish key. Fish A has a row of gill slits. Which step do you go to next?

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  7. 📖 This question is about a text that students read in the app.

    7. Use the fish key. A fish has a row of gill slits, and its eye is above the front end of its mouth. What is it?

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  8. 📖 This question is about a text that students read in the app.

    8. Use the fish key. A fish has a row of gill slits, and its eye is above the back end of its mouth. What is it?

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  9. 📖 This question is about a text that students read in the app.

    9. Use the fish key. No gill slits can be seen, and the fish has long spines on its top fin. What is it?

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  10. 📖 This question is about a text that students read in the app.

    10. Use the fish key. No gill slits can be seen, and the fish has short spines on its top fin. What is it?

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  11. 📖 This question is about a text that students read in the app.

    11. Use the fish key. Which statements lead to John Dory?

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  12. 📖 This question is about a text that students read in the app.

    12. Use the leaf key. Leaf A is oval and less than twice as long as it is wide. Which tree is it from?

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  13. 📖 This question is about a text that students read in the app.

    13. Use the leaf key. Leaf B is made up of many small leaflets. Which tree is it from?

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  14. 📖 This question is about a text that students read in the app.

    14. Use the leaf key. Leaf E is not made of leaflets, is not oval and has five lobes. Which tree is it from?

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  15. 📖 This question is about a text that students read in the app.

    15. Use the leaf key. A leaf is oval, at least twice as long as it is wide, and shiny. Which tree is it from?

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  16. 📖 This question is about a text that students read in the app.

    16. Use the leaf key. A leaf is oval, at least twice as long as it is wide, and dull. Which tree is it from?

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  17. 📖 This question is about a text that students read in the app.

    17. Use the leaf key. Which statements, in order, lead to willow?

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