Grade 9 Biology practice

What is on the worksheet

1. In supplied data, 3 of 57 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

2. In supplied data, 92 of 141 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

3. A fictional population starts at 382. During one interval: 50 births, 28 arrivals, 16 deaths and 37 departures. Find the final count. Round to 3 decimal places if needed.

4. A fictional circulation model has 97 beats/min and 64 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. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 348 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

6. Why is a sequence-answer question ambiguous if it ignores strand direction?

7. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 752 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

8. In supplied data, 33 of 86 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

9. In a canonical double-stranded DNA sample, adenine is 45% of all bases. Find the guanine percentage, assuming A = T and C = G. Round to 3 decimal places if needed. Answer in %.

10. In supplied data, 16 of 61 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

11. A supplied food-web model transfers 11% of 174 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. In supplied data, 94 of 98 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

13. A fictional population starts at 681. During one interval: 36 births, 31 arrivals, 24 deaths and 31 departures. Find the final count. Round to 3 decimal places if needed.

14. In supplied data, 13 of 87 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

15. A printed image is 7 mm long at 100× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

16. Which comparison can test a light-related effect more fairly?

    1. Different species with different water, soil and age at once.
    2. One leaf drawn twice.
    3. Comparable plants differing in light exposure while other conditions are controlled.

17. Supplied plant-tissue data show initial mass 6.6 g and final mass 7.7 g. Find signed percentage mass change. No experiment is required. Round to 3 decimal places if needed. Answer in %.

18. A supplied survey counts 157 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.

19. A fictional circulation model has 81 beats/min and 56 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.

20. A supplied food-web model transfers 13% of 514 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.