6.Which of the following is a true statement? a. There are always more heterotrophs than autotrophs in an ecosystem b. Only 10% of the energy is transferred from one trophic level to the next -- because of this energy loss, there are always more autotrophs c. In numbers pyramids, there are more autotrophs but no in biomass pyramids d. The number of species increases as the trophic level increases answer explain

6.Which of the following is a true statement? a. There are always more heterotrophs than autotrophs in an ecosystem b. Only 10% of the energy is transferred from one trophic level to the next -- because of this energy loss, there are always more autotrophs c. In numbers pyramids, there are more autotrophs but no in biomass pyramids d. The number of species increases as the trophic level increases answer explain

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter54: Ecosystems And Global Change

Section: Chapter Questions

Problem 10TYK: Which of the following statements is supported by the results of studies at the Hubbard Brook...

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In terrestrial ecosystems, the energy and biomass pyramids are the same in that they store the most at the bottom trophic levels (with primary producers). However, in aquatic ecosystems, the pyramids are inverted. Why is this? O None of these answers is correct. O Aquatic ecosystems have fewer plants and other autotrophs Aquatic ecosystems have more keystone predators Aquatic ecosystems have fewer decomposers Aquatic ecosystems have more types of filter feeders
3. Which trophic level converts energy into biomass with the highest food-chain efficiency? A. the fifth trophic level (quaternary consumers) B. the fourth trophic level (tertiary consumers) C. the third trophic level (secondary consumers) D. the second trophic level (primary consumers) E. the first trophic level (producers)
2. The trophic relationships in real biological communities are much more complex than a simple food chain. These more complex trophic relationships are shown in a food web. This diagram shows a small part of a food web. Notice that the food web contains multiple food chains. A. Circle the organisms in one of the food chains in this food web. B. Label the producer in the food chain you circled. mountain lion C. Explain why the hawk in this food web is a trophic omnivore, even though it does not eat both plants and animals. deer atrod ugog 10ods nous W snake rabbit trees hawk mouse- grasses frog Z cricket bas to AnidT A 46
1. Energy is said to flow in a "one-way" stream through an ecosystem. In your own words, describe what that means. NOTEBOOK
28. Which of the following is an accurate statement about ecosystems? a. Energy is recycled through the trophic structure. b. Energy is usually captured from sunlight by primary producers, passed to secondary producers in the form of organic compounds, & lost to detritivores as heat. c. Chemicals are recycled between the biotic and abiotic sectors, whereas energy makes a one way trip through the food web and is eventually dissipated as heat. d. There is a continuous process by which energy is lost as heat, and chemical elements leave the ecosystem through runoff. e. A food web shows that all trophic levels may feed off each other.
The number of trophic levels an ecosystem can support is driven by... (select all that apply) O The efficiency of energy transfer across trophic levels O The amount of energy available (primary productivity) O The speed of nutrient cycling (decomposition) O The composition of the plant community O The population size of top predators in the ecosystem
The amount of energy available at the highest trophic level in an ecosystem is determined by: a. only the gross primary productivity of the ecosystem. b. only the net primary productivity of the ecosystem. c. the gross primary productivity and the standing crop biomass. d. the net primary productivity and the ecological efficiencies of herbivores. e. the net primary productivity and the ecological efficiencies at all lower trophic levels.
Organisms at the lowest trophic level in a tallgrass prairie are all _______. a. two steps away from the original energy input b. autotrophs c. heterotrophs d. both a and b e. both a and c
A limiting resource does all the following except that it (a) tends to restrict the ecological niche of a species (b) is in short supply relative to a species need for it (c) limits the presence of a species in a given community (d) results in an intermediate disturbance (e) may be limiting for only part of an organisms life cycle
Which of the following statements is supported by the results of studies at the Hubbard Brook Experimental Forest? a. Most of the energy captured by primary producers is lostbefore it reaches the highest trophic level in an ecosystem. b. Deforested watersheds experience significantly less runoffthan undisturbed watersheds. c. Deforested watersheds lose more calcium and nitrogen inrunoff than undisturbed watersheds. d. Nutrients generally move through biogeochemical cycles veryquickly. e. Deforested watersheds generally receive more rainfall thanundisturbed watersheds.
Growth of a forest in an abandoned corn field is an example of _______. a. primary succession b. resource partitioning c. secondary succession d. competitive exclusion
Competition with other species helps determine an organisms (a) ecotone (b) fundamental niche (c) realized niche (d) limiting resource (e) ecosystem