Q1. Which of the following is the best example of a self-sustaining ecosystem?A. Crop fieldB. ForestC. AquariumD. Zoo
Q2. Which of the following statements about trophic levels is correct?A. Producers occupy the highest trophic levelB. Herbivores belong to the second trophic levelC. Energy increases as we move up the trophic levelsD. Carnivores belong to the first trophic level
Q3. Which of the following is an incorrect statement about the nitrogen cycle?A. Nitrogen fixation converts atmospheric nitrogen into usable formsB. Denitrification releases nitrogen gas back into the atmosphereC. Plants absorb nitrogen directly from the atmosphereD. Decomposers release nitrogen from organic matter into the soil
Q5. Which of the following describes a grazing food chain?A. Starts with detritus and decomposersB. Begins with living producersC. Includes only carnivoresD. Does not involve energy transfer
Q6. Which component of an ecosystem is responsible for the conversion of organic matter into inorganic nutrients?A. ProducersB. ConsumersC. DecomposersD. Herbivores
Q7. Which of the following best defines an ecosystem?A. A collection of only abiotic componentsB. A community of only biotic componentsC. An interaction between biotic and abiotic componentsD. A system that does not involve energy flow
Q8. Which of the following statements about net primary productivity (NPP) is incorrect?A. NPP is the energy available to herbivoresB. NPP is always greater than gross primary productivity (GPP)C. NPP accounts for energy lost in respirationD. NPP is influenced by environmental factors
Q9. What is the major role of decomposers in an ecosystem?A. To fix atmospheric nitrogenB. To break down organic matter into inorganic nutrientsC. To capture solar energyD. To act as primary consumers
Q10. Which of the following statements about the energy pyramid is correct?A. It can be inverted in some ecosystemsB. It is always uprightC. It represents only the number of organismsD. It shows that energy increases at higher trophic levels