Grade 10 Ecology & populations worksheet

What is on the worksheet

1. 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.

2. A supplied survey counts 83 plants in 8 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.

3. Supplied fictional records give M = 95 initially marked, C = 75 in a later sample, and R = 30 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.

4. A supplied food-web model transfers 25% of 1078 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.

5. A fictional population starts at 177. During one interval: 49 births, 7 arrivals, 47 deaths and 25 departures. Find the final count. Round to 3 decimal places if needed.

6. A supplied food-web model transfers 23% of 1314 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.

7. A fictional population starts at 475. During one interval: 12 births, 33 arrivals, 52 deaths and 13 departures. Find the final count. Round to 3 decimal places if needed.

8. Supplied fictional records give M = 20 initially marked, C = 76 in a later sample, and R = 6 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.

9. Supplied fictional records give M = 80 initially marked, C = 70 in a later sample, and R = 40 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.

10. Supplied fictional records give M = 65 initially marked, C = 64 in a later sample, and R = 46 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.

11. Supplied fictional records give M = 91 initially marked, C = 38 in a later sample, and R = 5 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.

12. A supplied survey counts 70 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.

13. A supplied survey counts 109 plants in 9 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 survey counts 103 plants in 7 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.

15. Supplied fictional records give M = 60 initially marked, C = 82 in a later sample, and R = 19 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.

16. A fictional population starts at 641. During one interval: 15 births, 11 arrivals, 10 deaths and 39 departures. Find the final count. Round to 3 decimal places if needed.

17. A supplied survey counts 183 plants in 7 non-overlapping quadrats, each 0.25 m². Find the mean density in the sampled area. Round to 3 decimal places if needed. Answer in plants/m².

18. A supplied survey counts 154 plants in 12 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.

19. Supplied fictional records give M = 31 initially marked, C = 88 in a later sample, and R = 17 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.

20. A supplied survey counts 100 plants in 8 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.