Grade 11 Biology practice

What is on the worksheet

1. Supplied fictional records give M = 25 initially marked, C = 52 in a later sample, and R = 8 marked in that sample. Use N ≈ MC/R under the stated assumptions. No animals are to be handled. Round to 3 decimal places if needed.

2. Supplied fictional records give M = 75 initially marked, C = 67 in a later sample, and R = 39 marked in that sample. Use N ≈ MC/R under the stated assumptions. No animals are to be handled. Round to 3 decimal places if needed.

3. A fictional population starts at 592. During one interval: 69 births, 27 arrivals, 40 deaths and 7 departures. Find the final count. Round to 3 decimal places if needed.

4. A supplied survey counts 188 plants in 5 non-overlapping quadrats, each 2 m². Find the mean density in the sampled area. Round to 3 decimal places if needed. Answer in plants/m².

5. A supplied food-web model transfers 16% of 587 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. Why is DNA replication not the same event as cell division?

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

8. A supplied food-web model transfers 19% of 878 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.

9. A supplied survey counts 14 plants in 8 non-overlapping quadrats, each 1 m². Find the mean density in the sampled area. Round to 3 decimal places if needed. Answer in plants/m².

10. Supplied plant-tissue data show initial mass 10.8 g and final mass 12.3 g. Find signed percentage mass change. No experiment is required. Round to 3 decimal places if needed. Answer in %.

11. A fictional population starts at 719. During one interval: 25 births, 20 arrivals, 10 deaths and 1 departures. Find the final count. Round to 3 decimal places if needed.

12. Supplied fictional records give M = 79 initially marked, C = 89 in a later sample, and R = 65 marked in that sample. Use N ≈ MC/R under the stated assumptions. No animals are to be handled. Round to 3 decimal places if needed.

13. A supplied survey counts 60 plants in 6 non-overlapping quadrats, each 0.5 m². Find the mean density in the sampled area. Round to 3 decimal places if needed. Answer in plants/m².

14. A supplied food-web model transfers 13% of 762 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.

15. Why might scientific classification change?

16. A fictional population starts at 409. During one interval: 72 births, 12 arrivals, 44 deaths and 10 departures. Find the final count. Round to 3 decimal places if needed.

17. A supplied survey counts 151 plants in 6 non-overlapping quadrats, each 2 m². Find the mean density in the sampled area. Round to 3 decimal places if needed. Answer in plants/m².

18. A supplied food-web model transfers 7% of 640 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.

19. A supplied food-web model transfers 7% of 667 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. A fictional population starts at 710. During one interval: 72 births, 17 arrivals, 39 deaths and 31 departures. Find the final count. Round to 3 decimal places if needed.