Grade 8 Ecology & populations worksheet in three levels
The same 20-question worksheet on ecology & populations in Support, Core and Challenge versions. Question by question, each version keeps the topic and changes the difficulty.
Easier questions on the same topics, for students who need more practice with the basics.
Questions
20 (20 medium)
Grade range
Grades 7 to 12
Topics
Ecology & populations
Sample questions
A supplied survey counts 67 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.
A fictional population starts at 247. During one interval: 45 births, 15 arrivals, 45 deaths and 31 departures. Find the final count. Round to 3 decimal places if needed.
A supplied food-web model transfers 24% of 895 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.
Core
Questions at the expected level for the grade.
Questions
20 (20 medium)
Grade range
Grades 7 to 12
Topics
Ecology & populations
Sample questions
A fictional population starts at 426. During one interval: 16 births, 35 arrivals, 9 deaths and 21 departures. Find the final count. Round to 3 decimal places if needed.
A supplied survey counts 194 plants in 7 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.
A supplied food-web model transfers 14% of 943 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.
Challenge
Harder questions on the same topics, for students who are ready to stretch.
Questions
20 (20 challenge)
Grade range
Grades 9 to 12
Topics
Ecology & populations
Sample questions
Supplied fictional records give M = 98 initially marked, C = 47 in a later sample, and R = 38 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.
Supplied fictional records give M = 81 initially marked, C = 78 in a later sample, and R = 60 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.
Supplied fictional records give M = 54 initially marked, C = 72 in a later sample, and R = 36 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.
Using the three versions
Start everyone with the same short explanation, then hand out Support, Core or Challenge.
Question numbers line up across the versions, so you can go through the answers with the whole class.
The PDF has a cover page and each version on its own pages; the answer keys PDF has all three keys.