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Grade 11 · Biology · three levels

Grade 11 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.

All three levels PDFAll three answer keysOriginal worksheet

Compare the three levels

Support

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

  1. A fictional population starts at 369. During one interval: 14 births, 26 arrivals, 49 deaths and 5 departures. Find the final count. Round to 3 decimal places if needed.
  2. 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.
  3. A supplied food-web model transfers 18% of 1124 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

  1. A fictional population starts at 246. During one interval: 22 births, 5 arrivals, 54 deaths and 15 departures. Find the final count. Round to 3 decimal places if needed.
  2. A supplied survey counts 51 plants in 4 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.
  3. 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.

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

  1. Supplied fictional records give M = 63 initially marked, C = 98 in a later sample, and R = 43 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.
  2. Supplied fictional records give M = 74 initially marked, C = 51 in a later sample, and R = 32 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.
  3. In this simplified food chain: kelp → sea urchin → sea otter. At which trophic level is “sea otter”? (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.

See the original worksheet or browse more three-level worksheets.