Q1. Which of the following ecosystems has the lowest net primary productivity?A. Tropical rainforestB. GrasslandC. DesertD. Wetland
Q2. Which of the following statements about detritus food chains is correct?A. It starts with living producersB. It begins with dead organic matterC. It does not involve decomposersD. It is independent of the grazing food chain
Q3. Which of the following statements about the nitrogen cycle is incorrect?A. Nitrogen fixation converts atmospheric nitrogen into usable formsB. Denitrification releases nitrogen gas into the atmosphereC. Plants directly absorb atmospheric nitrogenD. Decomposers release nitrogen from organic matter into the soil
Q4. Which of the following is an example of a producer in an aquatic ecosystem?A. PhytoplanktonB. ZooplanktonC. FishD. Crab
Q5. Which of the following statements about biogeochemical cycles is incorrect?A. They involve both living and non-living componentsB. They help recycle essential elementsC. Nutrients are lost permanently from the ecosystemD. Microorganisms play a role in nutrient cycling
Q6. Which of the following is NOT an example of a man-made ecosystem?A. Crop fieldB. ForestC. AquariumD. Garden
Q7. What is the primary function of decomposers in an ecosystem?A. Fixing carbon dioxideB. Breaking down organic matter into inorganic substancesC. Providing energy to herbivoresD. Capturing solar energy
Q8. Why is the detritus food chain important in a terrestrial ecosystem?A. It reduces the number of primary consumersB. It recycles nutrients into the ecosystemC. It produces more energy than the grazing food chainD. It increases the biomass of herbivores
Q9. Which of the following statements about the nitrogen cycle is correct?A. Plants directly absorb atmospheric nitrogenB. Denitrification converts nitrates into nitrogen gasC. Nitrogen fixation releases nitrogen gas into the airD. Decomposers are not involved in the nitrogen cycle
Q10. Which of the following best defines standing crop in an ecosystem?A. Total biomass of living organisms in a given area at a given timeB. Total energy produced by an ecosystem per yearC. Total number of consumers in an ecosystemD. Total amount of decomposed organic matter