Biology Practice: Ecosystems (Mock Test 3 - Advanced Mechanisms)
1. In an ecological pyramid of energy, why does the energy decrease as we move from lower to higher trophic levels?
2. Which of the following describes the 'Lichnes' (an interaction between algae and fungi)?
3. What is the main reason why a food chain usually consists of only 3 to 4 trophic levels?
4. The biogeochemical cycle that involves the circulation of nitrogen through living and non-living components is the:
5. 'Biological Magnification' (Biomagnification) refers to the:
6. In a 'Parasitic Food Chain', the pyramid of numbers is typically:
7. Which bacteria are responsible for converting atmospheric nitrogen into nitrates in the soil?
8. What happens to the CO2 levels in an ecosystem if the rate of deforestation increases?
9. The process by which nitrates are converted back into free atmospheric nitrogen is:
10. An ecosystem is said to be 'Balanced' when:
11. In the Carbon Cycle, 'Respiration' and 'Combustion' (burning) both result in the:
12. Why is 'Humus' important for the terrestrial ecosystem?
13. The role of an Owl in a food chain (Grass → Grasshopper → Frog → Snake → Owl) is that of a:
14. 'Eutrophication' is the process where a water body becomes overly enriched with nutrients, leading to:
15. The '10 Percent Law' of energy transfer was proposed by:
16. Non-biodegradable wastes are dangerous to an ecosystem because:
17. 'Endemic' species are those that are:
18. The 'Apex Predator' in an ecosystem has:
19. In a desert ecosystem, the 'limiting factor' for growth is usually:
20. The 'Biosphere' is the collection of all ________ on Earth.
