Structure of the biogeocenosis and ecosystem
Answers are for parents and teachers.
1
Imagining a garden or meadow, build a simple food chain of 4–6 organisms and write each one’s functional group.
E.g.: grass (producer) → grasshopper (consumer) → frog (consumer) → snake (consumer) → saprotrophic bacteria (reducer).
2
Compare ecosystem and biogeocenosis as a Venn diagram (shared/different).
Shared: living and non-living parts, flows of matter and energy; difference: size and a definite boundary.
3
Give an example of succession in a sand desert (e.g. dunes becoming fixed).
Moving sand → psammophyte plants → sand gets fixed → soil forms → community of grasses and shrubs.
4
How do fallen autumn leaves return to the soil? Which functional group takes part, and why is the process slower in cold or very dry conditions?
Reducers (saprotrophic fungi and bacteria), helped by soil animals, break the leaves down to minerals; in cold or dry conditions their activity drops, so the leaves decay slowly and pile up.