Grade 12 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 8 to 12
Topics
Ecology & populations
Sample questions
A fictional population starts at 724. During one interval: 63 births, 11 arrivals, 47 deaths and 28 departures. Find the final count. Round to 3 decimal places if needed.
A fictional population starts at 642. During one interval: 10 births, 37 arrivals, 39 deaths and 23 departures. Find the final count. Round to 3 decimal places if needed.
A fictional population starts at 500. During one interval: 61 births, 7 arrivals, 5 deaths and 1 departures. Find the final count. Round to 3 decimal places if needed.
Core
Questions at the expected level for the grade.
Questions
20 (20 medium)
Grade range
Grades 8 to 12
Topics
Ecology & populations
Sample questions
A fictional population starts at 297. During one interval: 40 births, 36 arrivals, 57 deaths and 31 departures. Find the final count. Round to 3 decimal places if needed.
A fictional population starts at 303. During one interval: 49 births, 26 arrivals, 53 deaths and 2 departures. Find the final count. Round to 3 decimal places if needed.
A fictional population starts at 576. During one interval: 28 births, 24 arrivals, 12 deaths and 22 departures. Find the final count. Round to 3 decimal places if needed.
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 = 36 initially marked, C = 100 in a later sample, and R = 26 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 = 87 initially marked, C = 46 in a later sample, and R = 7 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.
In this simplified food chain: algae → zooplankton → herring → seal. At which trophic level is “zooplankton”? (Producers are level 1.)
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.