Ecosystem - structure and function, energy flow, food chains food webs ecological pyramids - One Line Questions

1. If producers have 10,000 kcal of energy, how much energy is typically available to secondary consumers? — 100 kcal
2. Which of the following best defines a food chain? — The linear sequence of organisms where nutrients and energy are transferred
3. The process by which organisms break down complex organic compounds into simpler inorganic substances is called: — Decomposition
4. The sum total of all the organisms of one species in a particular area is called a: — Population
5. What is the term for organisms that produce their own food, usually through photosynthesis? — Autotrophs
6. Which of the following is a characteristic of a decomposer organism? — Feeds on dead organic matter
7. Which of the following is an example of a detritivore? — Earthworm
8. In which type of ecosystem is the pyramid of numbers often inverted? — Forest
9. An ecosystem's structure is defined by its: — Biodiversity and species composition
10. The pyramid of energy is always upright because: — Energy is lost as heat at each trophic level
11. What is the primary difference between a food chain and a food web? — Food chains are linear, food webs are complex networks
12. Which of the following is an abiotic component of an ecosystem? — Water
13. What is the main source of energy for almost all ecosystems on Earth? — Solar energy
14. Which of the following is an example of a secondary consumer in a grassland? — Frog
15. Which of the following is an example of a higher-level consumer that might be found at the top of a food web? — Fox
16. Which term describes all the living organisms in an ecosystem? — Community
17. What is the term for the role an organism plays in its ecosystem, including its interactions and resource use? — Niche
18. In a food web, an organism that feeds on both plants and animals is called a(n): — Omnivore
19. What happens to energy as it moves up trophic levels in an ecosystem? — It decreases
20. A food web is a more realistic representation of energy flow than a food chain because: — It depicts the interconnectedness of multiple food chains
21. What is the significance of the pyramid of energy? — It demonstrates the loss of energy at each trophic level
22. In a typical grassland ecosystem, which organism is most likely to be a primary consumer? — Grasshopper
23. The flow of energy in an ecosystem is: — Unidirectional
24. The '10% law' of energy transfer in an ecosystem states that: — Only 10% of available energy is transferred to the next trophic level
25. The total of all chemical processes that occur in living organisms is known as: — Metabolism
26. Which component of an ecosystem is responsible for converting solar energy into chemical energy stored in organic compounds? — Producers (plants and algae)
27. In a typical aquatic food chain, phytoplankton are: — Producers
28. In a simplified food chain: Grass -> Deer -> Wolf, what trophic level does the wolf occupy? — Secondary consumer
29. Which trophic level consists of organisms that directly consume producers? — Primary consumers
30. In a food chain, tertiary consumers feed on: — Secondary consumers
31. Which organisms are essential for nutrient cycling in an ecosystem? — Decomposers and detritivores
32. What is the primary function of decomposers in an ecosystem? — Breaking down dead organic matter and recycling nutrients
33. Which ecological pyramid is always inverted in aquatic ecosystems? — Pyramid of biomass
34. Which type of ecological pyramid represents the total amount of living matter at each trophic level? — Pyramid of biomass
35. Which of the following is a biotic component of an ecosystem? — Plants
36. Which of the following represents the energy transfer from producers to primary consumers? — Primary consumption
37. What limits the number of trophic levels in most ecosystems? — The decreasing energy transfer efficiency at each level
38. What does the base of an ecological pyramid represent? — The producers
39. What is the primary structure of an ecosystem related to its function? — The species composition and trophic organization
40. What does the term 'trophic level' refer to in an ecosystem? — The position an organism occupies in a food chain
41. What are ecological pyramids used to represent? — The quantitative relationships between trophic levels
42. What is a 'standing crop' in ecological terms? — The total biomass of organisms at a particular trophic level at a given time
43. The pyramid of biomass in a forest ecosystem is usually upright because: — The total biomass of producers (trees) is much greater than that of consumers
44. What is biomass in the context of an ecosystem? — The total mass of living or organic matter in a given area or volume
45. The pyramid of numbers in a forest ecosystem is usually upright because: — There are many producers (trees) supporting fewer herbivores
46. Which statement best describes the function of ecological pyramids? — They represent the relative amounts of energy, biomass, or numbers at each trophic level
47. What is the primary role of producers in an ecosystem? — To convert light energy into chemical energy
48. What is the primary function of consumers in an ecosystem? — To obtain energy by feeding on other organisms
49. A pond ecosystem typically has which type of pyramid of biomass? — Inverted
50. Which of the following is an example of a producer in a terrestrial ecosystem? — Oak tree
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