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4,500 | NDQ_008663 | ecosystems | The biotic component of an ecosystem is the population. | null | null | Multiple Choice | a. true, b. false | b |
4,501 | NDQ_008664 | ecosystems | All of the following could be classified as an ecosystem except a | null | null | Multiple Choice | a. pond., b. forest., c. dead tree., d. bare rock. | d |
4,502 | NDQ_008665 | ecosystems | Components of an ecosystem include | null | null | Multiple Choice | a. a community., b. species interactions., c. abiotic factors., d. all of the above | d |
4,503 | NDQ_008666 | ecosystems | Why can an ecosystem never be a closed system? | null | null | Multiple Choice | a. Energy must be constantly added to the ecosystem from outside., b. Matter must be constantly brought in to replace what is used up., c. Organisms must come into the ecosystem to replace those that die., d. all of the above | a |
4,504 | NDQ_008667 | ecosystems | A niche is the role in an ecosystem of a(n) | null | null | Multiple Choice | a. individual., b. species., c. community., d. none of the above | b |
4,505 | NDQ_008668 | ecosystems | The features of a habitat depend mainly on | null | null | Multiple Choice | a. abiotic factors., b. biotic factors., c. competition., d. two of the above | a |
4,506 | NDQ_008669 | ecosystems | A given habitat can have | null | null | Multiple Choice | a. just one niche., b. just one species., c. many different species., d. up to two species per niche. | c |
4,507 | NDQ_008670 | ecosystems | All of the following are recycled through ecosystems except | null | null | Multiple Choice | a. energy., b. carbon., c. nitrogen., d. water. | a |
4,508 | NDQ_008671 | ecosystems | An ecosystem is a unit of nature. | null | null | Multiple Choice | a. true, b. false | a |
4,509 | NDQ_008672 | ecosystems | Energy is constantly recycled through ecosystems. | null | null | Multiple Choice | a. true, b. false | b |
4,510 | NDQ_008673 | ecosystems | A major aspect of a species niche is how the species obtains energy and matter. | null | null | Multiple Choice | a. true, b. false | a |
4,511 | NDQ_008674 | ecosystems | A habitat is the physical environment to which a species has adapted. | null | null | Multiple Choice | a. true, b. false | a |
4,512 | NDQ_008675 | ecosystems | When two species occupy the same niche in the same habitat at the same time, both species always | null | null | Multiple Choice | a. true, b. false | b |
4,513 | NDQ_008676 | ecosystems | An ecosystem always covers a large geographic area. | null | null | Multiple Choice | a. true, b. false | b |
4,514 | NDQ_008677 | ecosystems | Features of a species habitat include relationships with other species. | null | null | Multiple Choice | a. true, b. false | b |
4,515 | NDQ_008721 | flow of energy | Organisms that are chemoautotrophs include some | null | null | Multiple Choice | a. archaeans., b. bacteria., c. plants and algae., d. two of the above | d |
4,516 | NDQ_008724 | flow of energy | Which of the following organisms are herbivores? | null | null | Multiple Choice | a. snails, b. frogs, c. crows, d. bears | a |
4,517 | NDQ_008725 | flow of energy | Decomposers that eat the soft tissues of animals that are already dead are called | null | null | Multiple Choice | a. detritivores., b. scavengers., c. saprotrophs., d. autotrophs. | b |
4,518 | NDQ_008728 | flow of energy | Most food chains and food webs have a maximum of | null | null | Multiple Choice | a. 2 trophic levels., b. 4 trophic levels., c. 6 trophic levels., d. 8 trophic levels. | b |
4,519 | NDQ_008730 | flow of energy | A human being who is eating an apple is feeding at | null | null | Multiple Choice | a. trophic level 1., b. trophic level 2., c. trophic level 3., d. trophic level 4. | b |
4,520 | NDQ_008735 | flow of energy | Energy enters most ecosystems in the form of chemical compounds. | null | null | Multiple Choice | a. true, b. false | b |
4,521 | NDQ_008738 | flow of energy | All ecosystems have organisms that are classified as producers. | null | null | Multiple Choice | a. true, b. false | a |
4,522 | NDQ_008740 | flow of energy | Chemoautotrophs include archaea and certain bacteria. | null | null | Multiple Choice | a. true, b. false | a |
4,523 | NDQ_008741 | flow of energy | Heterotrophs include producers and decomposers. | null | null | Multiple Choice | a. true, b. false | b |
4,524 | NDQ_008742 | flow of energy | Higher trophic levels have less biomass than lower trophic levels. | null | null | Multiple Choice | a. true, b. false | a |
4,525 | NDQ_008743 | flow of energy | About 90 percent of the energy at a given trophic level is passed up to the next trophic level. | null | null | Multiple Choice | a. true, b. false | b |
4,526 | NDQ_008744 | flow of energy | Examples of detritivores include fungi and cockroaches. | null | null | Multiple Choice | a. true, b. false | b |
4,527 | NDQ_008745 | flow of energy | An example of a saprotroph is a hyena. | null | null | Multiple Choice | a. true, b. false | b |
4,528 | NDQ_008746 | flow of energy | Most organisms are consumed by just one species. | null | null | Multiple Choice | a. true, b. false | b |
4,529 | NDQ_008747 | flow of energy | There are rarely more than four trophic levels in a food chain or food web. | null | null | Multiple Choice | a. true, b. false | a |
4,530 | NDQ_008748 | flow of energy | A food web shows who eats whom in an ecosystem. | null | null | Multiple Choice | a. true, b. false | a |
4,531 | NDQ_008749 | flow of energy | Consumers always feed at just one trophic level. | null | null | Multiple Choice | a. true, b. false | b |
4,532 | NDQ_008750 | flow of energy | __organism that breaks down organic wastes or remains | null | null | Multiple Choice | a. a.heterotroph, b. b.omnivore, c. c.producer, d. d.trophic level, e. e.energy, f. f.food chain, g. g.decomposer | g |
4,533 | NDQ_008751 | flow of energy | __diagram that represents a single pathway by which energy flows through an ecosystem | null | null | Multiple Choice | a. a.heterotroph, b. b.omnivore, c. c.producer, d. d.trophic level, e. e.energy, f. f.food chain, g. g.decomposer | f |
4,534 | NDQ_008752 | flow of energy | __ability to change or move matter | null | null | Multiple Choice | a. a.heterotroph, b. b.omnivore, c. c.producer, d. d.trophic level, e. e.energy, f. f.food chain, g. g.decomposer | e |
4,535 | NDQ_008753 | flow of energy | __organism that gets energy by consuming other organisms | null | null | Multiple Choice | a. a.heterotroph, b. b.omnivore, c. c.producer, d. d.trophic level, e. e.energy, f. f.food chain, g. g.decomposer | a |
4,536 | NDQ_008754 | flow of energy | __organism that consumes both plants and animals | null | null | Multiple Choice | a. a.heterotroph, b. b.omnivore, c. c.producer, d. d.trophic level, e. e.energy, f. f.food chain, g. g.decomposer | b |
4,537 | NDQ_008755 | flow of energy | __organism that makes food for itself and other organisms | null | null | Multiple Choice | a. a.heterotroph, b. b.omnivore, c. c.producer, d. d.trophic level, e. e.energy, f. f.food chain, g. g.decomposer | c |
4,538 | NDQ_008756 | flow of energy | __feeding position in a food chain or food web | null | null | Multiple Choice | a. a.heterotroph, b. b.omnivore, c. c.producer, d. d.trophic level, e. e.energy, f. f.food chain, g. g.decomposer | d |
4,539 | NDQ_008757 | flow of energy | Organisms that are photoautotrophs include | null | null | Multiple Choice | a. plants., b. certain fungi., c. all bacteria., d. two of the above | a |
4,540 | NDQ_008758 | flow of energy | Which of the following organisms are omnivores? | null | null | Multiple Choice | a. lions, b. frogs, c. rabbits, d. crows | d |
4,541 | NDQ_008759 | flow of energy | All of the following are decomposers except | null | null | Multiple Choice | a. scavengers., b. detritivores., c. autotrophs., d. saprotrophs. | c |
4,542 | NDQ_008760 | flow of energy | Which trophic level of a food chain consists of secondary consumers? | null | null | Multiple Choice | a. trophic level 1, b. trophic level 2, c. trophic level 3, d. trophic level 4 | c |
4,543 | NDQ_008761 | flow of energy | About 10 percent of the energy at any given trophic level is | null | null | Multiple Choice | a. used for metabolic processes., b. available for the next higher trophic level., c. given off as heat to the environment., d. used by producers such as plants to make food. | b |
4,544 | NDQ_008762 | flow of energy | Higher trophic levels tend to have | null | null | Multiple Choice | a. larger organisms., b. more organisms., c. more biomass., d. two of the above | a |
4,545 | NDQ_008763 | flow of energy | What do scavengers consume? | null | null | Multiple Choice | a. dead leaves, b. animal feces, c. dead animals, d. none of the above | c |
4,546 | NDQ_008807 | ecosystem change | Primary succession occurs in an area where | null | null | Multiple Choice | a. there is nothing but bare rock., b. thin soil is already present., c. a climax community is located., d. nothing has been disturbed. | a |
4,547 | NDQ_008810 | ecosystem change | Examples of pioneer species in primary succession include | null | null | Multiple Choice | a. grasses., b. trees., c. bacteria., d. two of the above | c |
4,548 | NDQ_008811 | ecosystem change | Secondary succession may occur following | null | null | Multiple Choice | a. a forest fire., b. a flood., c. farming activities., d. any of the above | d |
4,549 | NDQ_008814 | ecosystem change | In secondary succession, pioneer species may include | null | null | Multiple Choice | a. fireweed., b. shrubs., c. trees., d. none of the above | a |
4,550 | NDQ_008816 | ecosystem change | Which statement about climax communities is false? | null | null | Multiple Choice | a. They are stable., b. They rarely occur., c. They are the same for all ecosystems., d. two of the above | c |
4,551 | NDQ_008821 | ecosystem change | No ecosystem is completely unchanging. | null | null | Multiple Choice | a. true, b. false | a |
4,552 | NDQ_008824 | ecosystem change | All ecological change is either primary or secondary succession. | null | null | Multiple Choice | a. true, b. false | b |
4,553 | NDQ_008826 | ecosystem change | Wind and water help weather rock and form soil in primary succession. | null | null | Multiple Choice | a. true, b. false | a |
4,554 | NDQ_008827 | ecosystem change | Plants can grow in an area only after soil has formed. | null | null | Multiple Choice | a. true, b. false | a |
4,555 | NDQ_008828 | ecosystem change | Most ecosystems change continuously. | null | null | Multiple Choice | a. true, b. false | a |
4,556 | NDQ_008829 | ecosystem change | Two types of ecological succession are primary succession and climax succession. | null | null | Multiple Choice | a. true, b. false | b |
4,557 | NDQ_008830 | ecosystem change | Trees usually colonize an area before small plants such as grasses. | null | null | Multiple Choice | a. true, b. false | b |
4,558 | NDQ_008831 | ecosystem change | Primary succession may occur following a landslide or the retreat of a glacier. | null | null | Multiple Choice | a. true, b. false | a |
4,559 | NDQ_008832 | ecosystem change | Ecological succession always ends at a final, stable state. | null | null | Multiple Choice | a. true, b. false | b |
4,560 | NDQ_008833 | ecosystem change | Most ecosystems have climax communities. | null | null | Multiple Choice | a. true, b. false | b |
4,561 | NDQ_008834 | ecosystem change | As plants grow and die, they improve the soil by adding organic matter. | null | null | Multiple Choice | a. true, b. false | a |
4,562 | NDQ_008835 | ecosystem change | Primary succession occurs more quickly than secondary succession. | null | null | Multiple Choice | a. true, b. false | b |
4,563 | NDQ_008836 | ecosystem change | Which events would most likely produce conditions where primary succession would occur? | null | null | Multiple Choice | a. plowing by a farmer, b. retreating of a glacier, c. flooding by a river, d. burning of a forest | b |
4,564 | NDQ_008837 | ecosystem change | In primary succession, the first few species to colonize the area | null | null | Multiple Choice | a. can live on rock., b. weather rock., c. help form soil., d. all of the above | d |
4,565 | NDQ_008838 | ecosystem change | During primary succession, the first plants to live in the area | null | null | Multiple Choice | a. must be able to grow in thin, poor soil., b. use up all the organic matter in the soil., c. prevent trees from moving into the area., d. are usually tall plants such as shrubs. | a |
4,566 | NDQ_008839 | ecosystem change | Which statement about secondary succession is false? | null | null | Multiple Choice | a. It is faster than primary succession., b. The soil is already in place., c. Pioneer species include plants., d. none of the above | d |
4,567 | NDQ_008840 | ecosystem change | Which statement applies to most ecosystems? | null | null | Multiple Choice | a. They rarely change., b. They reach a final, stable community., c. They change continuously., d. They are rarely disturbed. | c |
4,568 | NDQ_008841 | ecosystem change | Adding organic matter to soil | null | null | Multiple Choice | a. improves soil quality., b. helps soil hold water., c. may allow shrubs and trees to grow., d. all of the above | d |
4,569 | NDQ_008842 | ecosystem change | Pioneer species | null | null | Multiple Choice | a. are the same in primary and secondary succession., b. always include plants such as grasses., c. are always the first species to colonize a disturbed area., d. all of the above | c |
4,570 | NDQ_008843 | ecosystem change | __type of succession that occurs in a formerly inhabited area | null | null | Multiple Choice | a. a.secondary succession, b. b.forest fire, c. c.ecological succession, d. d.climax community, e. e.pioneer species, f. f.primary succession, g. g.landslide | a |
4,571 | NDQ_008844 | ecosystem change | __theoretical, final stable state of an ecosystem | null | null | Multiple Choice | a. a.secondary succession, b. b.forest fire, c. c.ecological succession, d. d.climax community, e. e.pioneer species, f. f.primary succession, g. g.landslide | d |
4,572 | NDQ_008845 | ecosystem change | __first species to colonize a disturbed area | null | null | Multiple Choice | a. a.secondary succession, b. b.forest fire, c. c.ecological succession, d. d.climax community, e. e.pioneer species, f. f.primary succession, g. g.landslide | e |
4,573 | NDQ_008846 | ecosystem change | __type of succession that occurs in an area that has never before been colonized | null | null | Multiple Choice | a. a.secondary succession, b. b.forest fire, c. c.ecological succession, d. d.climax community, e. e.pioneer species, f. f.primary succession, g. g.landslide | f |
4,574 | NDQ_008847 | ecosystem change | __possible cause of primary succession | null | null | Multiple Choice | a. a.secondary succession, b. b.forest fire, c. c.ecological succession, d. d.climax community, e. e.pioneer species, f. f.primary succession, g. g.landslide | g |
4,575 | NDQ_008848 | ecosystem change | __any change over time in the numbers and types of species in an ecosystem | null | null | Multiple Choice | a. a.secondary succession, b. b.forest fire, c. c.ecological succession, d. d.climax community, e. e.pioneer species, f. f.primary succession, g. g.landslide | c |
4,576 | NDQ_008849 | ecosystem change | __possible cause of secondary succession | null | null | Multiple Choice | a. a.secondary succession, b. b.forest fire, c. c.ecological succession, d. d.climax community, e. e.pioneer species, f. f.primary succession, g. g.landslide | b |
4,577 | NDQ_008979 | biodiversity and extinction | Which of the following types of ecosystems has the greatest biodiversity? | null | null | Multiple Choice | a. tropical dry forest, b. temperate rainforest, c. coral reef, d. savannah | c |
4,578 | NDQ_008982 | biodiversity and extinction | Wild species of living things provide human beings with | null | null | Multiple Choice | a. drugs., b. dyes., c. food., d. all of the above | d |
4,579 | NDQ_008983 | biodiversity and extinction | Which statement about extinction is false? | null | null | Multiple Choice | a. Extinction is the ultimate fate of almost all species., b. Dozens of species are currently going extinct every day., c. A total of three mass extinctions occurred on Earth in the past., d. Past mass extinctions were caused by geologic and climatic events. | c |
4,580 | NDQ_008986 | biodiversity and extinction | Which animals have high rates of extinction today because they are particularly sensitive to environmental toxins? | null | null | Multiple Choice | a. fish, b. amphibians, c. reptiles, d. insects | b |
4,581 | NDQ_008988 | biodiversity and extinction | Plants help protect the environment by | null | null | Multiple Choice | a. removing oxygen from the air., b. reducing erosion of the soil., c. fixing nitrogen in the soil., d. two of the above | b |
4,582 | NDQ_008993 | biodiversity and extinction | Biodiversity is an important natural resource. | null | null | Multiple Choice | a. true, b. false | a |
4,583 | NDQ_008996 | biodiversity and extinction | Scientists have already discovered most of the species that are alive today. | null | null | Multiple Choice | a. true, b. false | b |
4,584 | NDQ_008998 | biodiversity and extinction | Scientists estimate that there are a total of 100 million species currently in existence. | null | null | Multiple Choice | a. true, b. false | b |
4,585 | NDQ_008999 | biodiversity and extinction | Products that living things provide include rubber, dyes, and adhesives. | null | null | Multiple Choice | a. true, b. false | a |
4,586 | NDQ_009000 | biodiversity and extinction | Scientists have identified about 7.9 million living species. | null | null | Multiple Choice | a. true, b. false | b |
4,587 | NDQ_009001 | biodiversity and extinction | Wild organisms maintain a valuable pool of genetic variation. | null | null | Multiple Choice | a. true, b. false | a |
4,588 | NDQ_009002 | biodiversity and extinction | More than half of the most important prescription drugs come from wild species. | null | null | Multiple Choice | a. true, b. false | a |
4,589 | NDQ_009003 | biodiversity and extinction | Microorganisms purify water and decompose organic matter. | null | null | Multiple Choice | a. true, b. false | a |
4,590 | NDQ_009004 | biodiversity and extinction | Amphibians are particularly sensitive to environmental toxins because of their permeable skin. | null | null | Multiple Choice | a. true, b. false | a |
4,591 | NDQ_009005 | biodiversity and extinction | Most domestic species have been bred to be genetically variable. | null | null | Multiple Choice | a. true, b. false | b |
4,592 | NDQ_009006 | biodiversity and extinction | Predatory birds and spiders increase the need for chemical pesticides. | null | null | Multiple Choice | a. true, b. false | b |
4,593 | NDQ_009007 | biodiversity and extinction | About half of the wetlands in the U.S. have already been destroyed. | null | null | Multiple Choice | a. true, b. false | a |
4,594 | NDQ_009008 | biodiversity and extinction | __species that is introduced to a new habitat where it never existed before | null | null | Multiple Choice | a. a.biodiversity, b. b.exotic species, c. c.pollination, d. d.extinction, e. e.habitat loss, f. f.mass extinction, g. g.coral reef | b |
4,595 | NDQ_009009 | biodiversity and extinction | __extinction event in which many species go extinct around the same time | null | null | Multiple Choice | a. a.biodiversity, b. b.exotic species, c. c.pollination, d. d.extinction, e. e.habitat loss, f. f.mass extinction, g. g.coral reef | f |
4,596 | NDQ_009010 | biodiversity and extinction | __variety of life and its processes | null | null | Multiple Choice | a. a.biodiversity, b. b.exotic species, c. c.pollination, d. d.extinction, e. e.habitat loss, f. f.mass extinction, g. g.coral reef | a |
4,597 | NDQ_009011 | biodiversity and extinction | __complete dying out of a species | null | null | Multiple Choice | a. a.biodiversity, b. b.exotic species, c. c.pollination, d. d.extinction, e. e.habitat loss, f. f.mass extinction, g. g.coral reef | d |
4,598 | NDQ_009012 | biodiversity and extinction | __one of the most biodiverse ecosystems on Earth | null | null | Multiple Choice | a. a.biodiversity, b. b.exotic species, c. c.pollination, d. d.extinction, e. e.habitat loss, f. f.mass extinction, g. g.coral reef | g |
4,599 | NDQ_009013 | biodiversity and extinction | __single biggest cause of extinction at present | null | null | Multiple Choice | a. a.biodiversity, b. b.exotic species, c. c.pollination, d. d.extinction, e. e.habitat loss, f. f.mass extinction, g. g.coral reef | e |
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