Grade 9 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 fictional population starts at 531. During one interval: 45 births, 12 arrivals, 60 deaths and 9 departures. Find the final count. Round to 3 decimal places if needed.
A supplied survey counts 26 plants in 7 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.
A fictional population starts at 838. During one interval: 52 births, 34 arrivals, 8 deaths and 29 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 7 to 12
Topics
Ecology & populations
Sample questions
A supplied food-web model transfers 13% of 1212 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.
A supplied food-web model transfers 6% of 1086 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.
A fictional population starts at 267. During one interval: 66 births, 27 arrivals, 15 deaths and 37 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
In this simplified food chain: phytoplankton → krill → baleen whale. At which trophic level is “krill”? (Producers are level 1.)
In this simplified food chain: willow shrubs → moose → wolf. At which trophic level is “willow shrubs”? (Producers are level 1.)
In this simplified food chain: grass → grasshopper → frog → snake → hawk. At which trophic level is “grass”? (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.