AP Environmental Science Ecosystems — practice questions
22 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice AP Environmental Science Ecosystems in the app →Two parameters describe how an ecosystem copes with disturbance. What are they?Roughly what share of all photosynthesis on Earth is carried out by phytoplankton?What does a food chain describe?What name is given to the organism at the very top of a food chain?Food webs describe real ecosystems better, so why do ecologists still use food chains?What sits at the base of a detrital food web?What energy source does a chemoautotroph use?No sunlight reaches a deep hydrothermal vent, yet a rich community lives there. What supports it?In the Silver Springs ecosystem, roughly what fraction of the energy passed from the producers to the primary How does net production efficiency compare between cold blooded and warm blooded animals?Pyramids of numbers and of biomass can both be inverted. What about pyramids of energy?In the English Channel the producers hold less biomass than the consumers above them. What explains that inverWhat is the recycling of inorganic matter between organisms and their environment called?What does the residence time of a water molecule measure?In which chemical form is most of the carbon in the ocean found?Nitrogen gas makes up most of the air, yet plants cannot use it directly. What brings nitrogen into living thiNitrogen returns from living tissue to the air in three bacterial steps on land. In what order do they run?Fertilizer washes off farmland and into a river mouth. Which process follows?How long does the average phosphate ion stay in the ocean?One of the worst dead zones lies off the coast of the United States. Which river basin feeds it?Burning coal releases sulfur compounds into the air. What does rain falling through them become?Chesapeake Bay oyster reefs covered more than 200,000 acres in the 1700s. Roughly what area remains?