Biology Practice: Ecosystem (Mock Test 4 - Expert/Experimental Logic)
1. In an experiment, a scientist removes all the primary consumers from a grassland. What is the most likely immediate effect on the ecosystem?
2. Analysis of a pond reveals high concentrations of DDT in predatory birds but almost negligible amounts in the water. This clinical phenomenon is:
3. Why is an "Inverted Pyramid of Biomass" often observed in marine (aquatic) ecosystems?
4. A data-based study shows that for every 1000 kcal of energy fixed by grass, only 1 kcal reaches the hawk in a 4-step food chain. This follows:
5. In a "Lichen", the relationship between the Alga and the Fungus is an expert example of obligate mutualism because:
6. If an ecosystem has a Gross Primary Productivity (GPP) of 500 units and the producers use 200 units for respiration, the Net Primary Productivity (NPP) is:
7. Which of the following experimental setups would best demonstrate the role of decomposers?
8. "Nitrosomonas" and "Nitrobacter" are bacteria that perform "Nitrification", which involves:
9. In a "Parasitic Food Chain", the pyramid of numbers is usually:
10. The sudden bloom of Algae in a lake, leading to Oxygen depletion and fish death, is a clinical state known as:
11. Which organism is likely to occupy more than one trophic level in the same ecosystem simultaneously?
12. "Ammunification" is a step in the Nitrogen cycle where:
13. In the context of energy flow, why is the length of a food chain generally limited to 3-4 trophic levels?
14. "Commensalism" is an interaction (+/0). Which of these is an example?
15. What is the fate of the energy that is NOT transferred to the next trophic level?
16. The "Carbon Cycle" is largely regulated by which two opposing biological processes?
17. Which of the following is a "Sedimentary" nutrient cycle where the reservoir is the Earth's crust?
18. "Ecological Succession" on a bare rock (Xerarch) usually begins with which pioneer species?
19. Why are top carnivores most vulnerable to extinction in a disturbed ecosystem?
20. The symbiotic association of "Rhizobium" bacteria in root nodules of legumes is an expert example of:
