Grade 10 Biology practice

What is on the worksheet

1. A supplied food-web model transfers 14% of 801 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.

2. A supplied food-web model transfers 18% of 711 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.

3. A supplied survey counts 157 plants in 9 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.

4. A fictional circulation model has 59 beats/min and 53 mL/beat. Find its flow in mL/min. These are supplied model values, not diagnostic ranges. Round to 3 decimal places if needed. Answer in mL/min.

5. A fictional population starts at 850. During one interval: 71 births, 40 arrivals, 39 deaths and 12 departures. Find the final count. Round to 3 decimal places if needed.

6. A printed image is 32 mm long at 50× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

7. Supplied plant-tissue data show initial mass 3 g and final mass 2.1 g. Find signed percentage mass change. No experiment is required. Round to 3 decimal places if needed. Answer in %.

8. A supplied food-web model transfers 24% of 1023 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 food-web model transfers 14% of 219 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 fictional population starts at 574. During one interval: 28 births, 35 arrivals, 13 deaths and 37 departures. Find the final count. Round to 3 decimal places if needed.

11. A supplied food-web model transfers 23% of 289 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. Supplied fictional records give M = 66 initially marked, C = 41 in a later sample, and R = 9 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 fictional population starts at 405. During one interval: 26 births, 8 arrivals, 45 deaths and 32 departures. Find the final count. Round to 3 decimal places if needed.

14. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 796 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

15. A supplied food-web model transfers 6% of 562 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.

16. A fictional circulation model has 78 beats/min and 71 mL/beat. Find its flow in mL/min. These are supplied model values, not diagnostic ranges. Round to 3 decimal places if needed. Answer in mL/min.

17. A printed image is 63 mm long at 200× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

18. Supplied plant-tissue data show initial mass 6.5 g and final mass 8.2 g. Find signed percentage mass change. No experiment is required. Round to 3 decimal places if needed. Answer in %.

19. A supplied survey counts 106 plants in 4 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.

20. Supplied fictional records give M = 37 initially marked, C = 47 in a later sample, and R = 29 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.