BIOLOGY 1050 FINAL EXAM UNIT 4

(LO 4.21) How much of the energy consumed passes to the next trophic level? All of the energy from one trophic level passes to the next. Only chemicals, not energy, pass from one trophic level to the next. About 10% to 15% of the energy passes from primary producers to primary consumers, and up each level of consumer. About 50% of the energy passes from producers to primary consumers, then 1% up each level of consumer

About 10% to 15% of the energy passes from primary producers to primary consumers, and up each level of consumer.

(LO 4.23) The temperature of the Earth is increasing because there are more primary producers than there used to be. the oceans are getting more acidic. carbon dioxide is being released from fossil fuels. there are fewer consumers than there used to be. there is less methane being released into the atmosphere.

carbon dioxide is being released from fossil fuels.

(LO 4.23) The temperature of the Earth is increasing because there are fewer secondary consumers than there used to be. carbon dioxide is being released from fossil fuels. there are more primary producers than there used to be. the oceans are getting more acidic. there is less methane being released into the atmosphere.

carbon dioxide is being released from fossil fuels.

(LO 4.20) In an ecosystem, __________ usually cycle(s) within the ecosystem, and __________ usually flow(s) through the ecosystem. chemicals, energy energy, chemicals decomposers, animals plants, animals animals, plants

chemicals, energy

(LO 4.19) Which of the following is least likely to be a problem of traditional agriculture? topsoil erosion overuse of ground water that can lead to sink holes increased biodiversity addition of herbicides and pesticides to the environment increased salinity of the soil due to irrigation

increased biodiversity

(LO 4.19) Which of the following is least likely to be a problem of traditional agriculture? topsoil erosion addition of herbicides and pesticides to the environment increased biodiversity overuse of ground water that can lead to sink holes increased salinity of the soil due to irrigation

increased biodiversity

(LO 4.19) Which of the following is most likely to reduce a negative effect of agriculture? using ground water for irrigation, instead of rainwater planting crops in long parallel rows, especially in flat terrain, so that the tractors can remove all of the non-crop plants from the topsoil using plenty of herbicides to reduce the numbers of non-crop plants minimizing water use with water-conserving irrigation using large amounts of fertilizers to increase crop yield, even if excess fertilizer washes off the fields

minimizing water use with water-conserving irrigation

(LO 4.21) The average net productivity of open ocean and of desert and semidesert scrub are roughly equal to each other and are each about 100 g/m2/yr. The Earth has more open ocean than it has desert and semidesert scrub. From this information you would predict that added together the open oceans, deserts and semidesert scrub of the Earth produces 200 g/yr of biomass. added together the open oceans, deserts and semidesert scrub of the Earth produces 300 g/yr of biomass. an equal amount of the Earth's net primary production is from open ocean and from desert and semidesert scrub. more of the Earth's net primary production is from open ocean, than from desert and semidesert scrub. less of the Earth's net primary production is from open ocean, than from desert and semidesert scrub.

more of the Earth's net primary production is from open ocean, than from desert and semidesert scrub.

(LO 4.20) Which of the following best describes the flow of energy through an ecosystem? heat enters, is converted to chemical energy and is released as light energy sunlight energy enters, is converted to chemical energy then is permanently stored as fossil fuels heat enters, turns into biotic chemicals, then is converted back to heat and released chemical energy enters, is converted to other forms of chemical energy, and is washed out of the ecosystem as medium-sized molecules sunlight energy enters, is converted to chemical energy and is released as heat

sunlight energy enters, is converted to chemical energy and is released as heat