5 Written questions
5 Matching questions
- a Organisms that rely on other organisms for their energy and food supply
- b All the organisms that inhabit a particular area; an assemblage of populations of different species living close enough together for potential interaction.
- c The entire portion of Earth inhabited by life; the sum of all the planet's ecosystems.
- d Organisms that produce their own food
- e Organisms that obtain energy by eating only plants
5 Multiple choice questions
- Rate at which all the plants in an ecosystem produce net useful chemical energy; equal to the difference between the rate at which the plants in an ecosystem produce useful chemical energy (gross primary productivity) and the rate at which they use some of that energy through cellular respiration. Compare gross primary productivity.
- Diagram representing the flow of energy through each trophic level in a food chain or food web. With each energy transfer, only a small part (typically 10%) of the usable energy entering one trophic level is transferred to the organisms at the next trophic level. Compare pyramid of biomass, pyramid of numbers.
- Series of steps in an ecosystem in which organisms transfer energy by eating and being eaten.
- All organisms that are the same number of energy transfers away from the original source of energy (for example, sunlight) that enters an ecosystem. For example, all producers belong to the first trophic level, and all herbivores belong to the second trophic level in a food chain or a food web.
- A catabolic process that makes a limited amount of ATP from glucose without an electron transport chain and that produces a characteristic end product, such as ethyl alcohol or lactic acid.
5 True/False questions
Biomass → Pertaining to life; environmental factors created by living organisms
Hydrosphere → The earth's liquid water (oceans, lakes, other bodies of surface water, and underground water), frozen water (polar ice caps, floating ice caps, and ice in soil, known as permafrost), and water vapor in the atmosphere. See also hydrologic cycle.
Greenhouse effect → Heat buildup in the troposphere because of the presence of certain gases, called greenhouse gases. Without this effect, the earth would be nearly as cold as Mars, and life as we know it could not exist. Compare global warming.
Population → A catabolic process that makes a limited amount of ATP from glucose without an electron transport chain and that produces a characteristic end product, such as ethyl alcohol or lactic acid.
Biogeochemical cycles → The pathways by which chemicals circulate through ecosystems that involve both living (biotic) and nonliving (geological) components.