Subjects
Choose questions individually, practise online, or create a worksheet with matching answers. Counts include generated variants, not only authored originals.
The rabbit obtains energy by eating grass.
The arrow points toward the energy recipient.
Grass.
Grass produces organic matter using photosynthesis.
Organisms can have multiple feeding relationships.
A web allows connected pathways.
100
0.20 × 500 = 100; the efficiency is supplied, not assumed universal.
Energy is transferred and dissipated, while atoms can be reused across chemical forms.
Distinguish energy flow from matter cycling.
Breaking down organic material and helping recycle nutrients.
Decomposition transfers matter into reusable forms.
Use arrows consistently and distinguish cycling matter from flowing energy.
Grades 4–8Use arrows consistently and distinguish cycling matter from flowing energy.
Grades 4–8Make estimates with assumptions and report their limits.
Grades 8–11Make estimates with assumptions and report their limits.
Grades 8–11Use births, deaths and movement as separate terms.
Grades 9–12Use births, deaths and movement as separate terms.
Grades 9–12Divide the total counted organisms by the total sampled area. Density is not the same as total population size.
Grades 8–11Add births and immigration; subtract deaths and emigration. All counts refer to the same interval.
Grades 8–12Convert the supplied transfer efficiency to a fraction. Do not assume that all food webs have a fixed 10% efficiency.
Grades 7–11Use supplied records only. Assume a closed population, equal capture probability, mixing and retained marks. The estimate has sampling uncertainty.
Grades 10–12Formula reference
Grades 7–12This deterministic model assumes constant r and carrying capacity K; it is not a guaranteed population forecast.
UniversityThis deterministic model assumes constant r and carrying capacity K; it is not a guaranteed population forecast.
University