1 Which of the following is a symbiotic relationship where both organisms benefit? A Parasitism B Commensalism C Mutualism D Predation
2 In a food chain, which organism is at the first trophic level? A Primary consumer B Secondary consumer C Producer D Decomposer
3 What is a food chain? A A network of all feeding relationships B A sequence showing how energy flows from one organism to another C A group of organisms that eat the same food D A system of decomposers
4 What is a community in ecology? A A single species living in an area B All the different populations living in an area C All the abiotic factors in an area D A group of only producers
5 What is biodiversity? A The number of species in an ecosystem B The amount of water in an ecosystem C The size of an ecosystem D The temperature of an ecosystem
7 What is the role of oxygen in an ecosystem? A To produce food B To support respiration in organisms C To decompose dead matter D To create soil
8 Which of the following is an example of competition in an ecosystem? A A lion hunting a zebra B Two birds competing for the same nesting site C A plant providing oxygen D A fungus decomposing a log
10 What is a trophic level in an ecosystem? A The position an organism occupies in a food chain B The type of habitat an organism lives in C The size of an organism's population D The temperature of the ecosystem
11 Which of the following is a non-renewable resource? A Wind energy B Solar energy C Petroleum D Water
12 What is a predator? A An organism that is eaten B An organism that hunts and eats other organisms C An organism that decomposes dead matter D An organism that produces food
13 What is the main cause of global warming related to ecosystems? A Increased oxygen levels B Increased carbon dioxide levels C Decreased nitrogen levels D Increased rainfall
14 Which of the following is an abiotic factor that limits population size? A Predation B Disease C Availability of water D Competition
15 Which of the following is an example of a population in a forest? A All the trees B All the deer C All the animals D All the plants
16 Which of the following is an example of commensalism? A A tick feeding on a dog B A bee pollinating a flower C A barnacle attaching to a whale D A lion eating a zebra
17 What is the definition of an ecosystem's carrying capacity? A The maximum number of organisms an environment can support B The number of predators in the ecosystem C The total biomass of producers D The amount of water available
18 Which of the following is a renewable resource in an ecosystem? A Fossil fuels B Minerals C Freshwater D Soil
19 What is the ultimate source of energy for most ecosystems? A The moon B The sun C Geothermal energy D Wind
21 What is the effect of introducing an invasive species? A It increases biodiversity B It disrupts the existing ecosystem balance C It provides more food for native species D It has no effect
22 What is the term for organisms that eat both plants and animals? A Herbivores B Carnivores C Omnivores D Decomposers
23 Which of the following is an example of a population? A All the organisms in a pond B All the frogs in a pond C All the animals and plants in a forest D The water and soil in a garden
24 What is parasitism? A Both organisms benefit B One organism benefits and the other is harmed C One organism benefits and the other is unaffected D Both organisms are harmed