Grade 9 Ecology & populations worksheet

What is on the worksheet

1. A supplied survey counts 37 plants in 10 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.

2. A supplied survey counts 16 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.

3. A fictional population starts at 655. During one interval: 40 births, 2 arrivals, 46 deaths and 30 departures. Find the final count. Round to 3 decimal places if needed.

4. A supplied food-web model transfers 11% of 994 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 866. During one interval: 39 births, 25 arrivals, 38 deaths and 40 departures. Find the final count. Round to 3 decimal places if needed.

6. A fictional population starts at 627. During one interval: 59 births, 11 arrivals, 12 deaths and 15 departures. Find the final count. Round to 3 decimal places if needed.

7. A supplied survey counts 115 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.

8. A supplied survey counts 23 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.

9. A supplied food-web model transfers 6% of 359 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 18% of 340 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 fictional population starts at 203. During one interval: 20 births, 19 arrivals, 44 deaths and 9 departures. Find the final count. Round to 3 decimal places if needed.

12. A supplied survey counts 40 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.

13. 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.

14. A supplied survey counts 106 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.

15. A fictional population starts at 860. During one interval: 25 births, 36 arrivals, 21 deaths and 20 departures. Find the final count. Round to 3 decimal places if needed.

16. A fictional population starts at 431. During one interval: 18 births, 22 arrivals, 57 deaths and 38 departures. Find the final count. Round to 3 decimal places if needed.

17. A fictional population starts at 670. During one interval: 43 births, 34 arrivals, 45 deaths and 20 departures. Find the final count. Round to 3 decimal places if needed.

18. A supplied food-web model transfers 12% of 990 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 fictional population starts at 159. During one interval: 69 births, 17 arrivals, 13 deaths and 3 departures. Find the final count. Round to 3 decimal places if needed.

20. A supplied survey counts 25 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.