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Grade 7 · Biology

Grade 7 Biology practice

20 questions on plant biology, ecology & populations, cells & microscopy, human biology & physiology. The answer key is a separate download.

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What is on the worksheet

  1. In supplied data, 1 of 22 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

  2. What does dispersal describe?

    1. Movement of seeds or other reproductive units away from their source.
    2. Only DNA copying.
    3. Always gamete fusion.

  3. A supplied food-web model transfers 14% of 1334 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.

  4. A printed image is 48 mm long at 200× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

  5. A supplied food-web model transfers 12% of 811 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.

  6. A printed image is 60 mm long at 40× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

  7. A supplied food-web model transfers 21% of 1456 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.

  8. A printed image is 5 mm long at 200× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

  9. A printed image is 80 mm long at 200× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

  10. A supplied food-web model transfers 16% of 1492 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.

  11. A supplied food-web model transfers 7% of 1345 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.

  12. A printed image is 71 mm long at 100× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

  13. What does aerobic refer to in the standard respiration model?

    1. Only motion through air.
    2. No chemical reactions.
    3. Use of oxygen in the pathway.

  14. A printed image is 15 mm long at 40× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

  15. Why does an oxygen-bubble count give only an indirect measure of photosynthesis?

  16. A supplied food-web model transfers 14% of 1045 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.

  17. A supplied food-web model transfers 8% of 1368 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.

  18. In supplied data, 10 of 23 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

  19. A supplied food-web model transfers 8% of 1215 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.

  20. In supplied data, 76 of 78 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

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