Grade 8 Ecology & populations worksheet

What is on the worksheet

1. A fictional population starts at 521. During one interval: 40 births, 4 arrivals, 11 deaths and 39 departures. Find the final count. Round to 3 decimal places if needed.

2. A fictional population starts at 899. During one interval: 39 births, 22 arrivals, 39 deaths and 14 departures. Find the final count. Round to 3 decimal places if needed.

3. A supplied survey counts 61 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.

4. A fictional population starts at 831. During one interval: 59 births, 31 arrivals, 27 deaths and 29 departures. Find the final count. Round to 3 decimal places if needed.

5. A supplied food-web model transfers 18% of 592 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 supplied food-web model transfers 15% of 200 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 894. During one interval: 15 births, 13 arrivals, 60 deaths and 22 departures. Find the final count. Round to 3 decimal places if needed.

8. A supplied survey counts 96 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.

9. 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.

10. A supplied food-web model transfers 21% of 748 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 survey counts 91 plants in 5 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.

12. A supplied survey counts 95 plants in 11 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 46 plants in 8 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.

14. A supplied survey counts 147 plants in 10 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.

15. A supplied survey counts 45 plants in 12 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.

16. A fictional population starts at 211. During one interval: 71 births, 30 arrivals, 11 deaths and 23 departures. Find the final count. Round to 3 decimal places if needed.

17. A stated model transfers 20% of 500 energy units to the next level. How many units are transferred?

18. A fictional population starts at 849. During one interval: 21 births, 26 arrivals, 42 deaths and 16 departures. Find the final count. Round to 3 decimal places if needed.

19. A supplied food-web model transfers 17% of 674 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 supplied survey counts 166 plants in 5 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.