Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 59, Problem 6TY
Summary Introduction
Introduction: DDT (dichloro diphenyl trichloroethane) is an important insecticide which is used for the control of mosquito-borne malaria. DDT has various chemical properties that have an important ecological effect.
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a. What factors cause energy to decrease with each trophic level?b. How is it possible for energy to be lost and the ecosystem to stillrun efficiently?c. Are the nutrients on the earth a renewable resource? Why or why not?
Which of the following has the greatest effect on the rate ofchemical cycling in an ecosystem?(A) the rate of decomposition in the ecosystem(B) the production efficiency of the ecosystem’s consumers(C) the trophic efficiency of the ecosystem(D) the location of the nutrient reservoirs in the ecosystem
a) Each trophic level, on average, will move 10% of the energy tied up in molecules to the next trophic level. How much of the energy from the sun is actually brought in to the first trophic level?
b) When the producers convert energy and tie it up in the first trophic level, it is brought in as heat. True or false?
c) Which of the following are true about ecosystems? Check all that apply.
They contain both living and nonliving components.They contain both living and nonliving components.
There is a transfer of energy through the system and some energy is lost as heat energy.There is a transfer of energy through the system and some energy is lost as heat energy.
Nutrients repeatedly cycle through the ecosystem.Nutrients repeatedly cycle through the ecosystem.
They represent the lowest level of biological organization.They represent the lowest level of biological organization.
The ultimate source of energy for most ecosystems is organic molecules.
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- Which biogeochemical cycle does not have a gaseous component but cycles from the land to sediments in the ocean and back to the land? (a) carbon cycle (b) nitrogen cycle (c) phosphorus cycle (d) hydrologic cycle (e) neither a nor c has a gaseous componentarrow_forwardOrganisms at the first trophic level ________. a. capture energy from a nonliving source b. are eaten by organisms at lower trophic levels c. are shown at the top of an energy pyramid d. are consumersarrow_forwardOne of the lessons from a pyramid of production is that _____. A) eating grain-fed beef is an inefficient means of obtaining the energy trapped by photosynthesis B) the energy lost as heat or lost in cellular respiration is 10% of the available energy of each trophic level C) only one-half of the energy in one trophic level is passed on to the next level D) most of the energy from one trophic level is incorporated into the biomass of the next level E) production efficiency is highest for primary consumersarrow_forward
- Alberta Einstein might have said once that: “if the bee disappears from the surface of the earth, man would have no more than four years to live. No more bees, no more pollination, no more plants, no more animals, no more man.” Pollination is an example of a large-scale process with significant implications for humans described as a/an: a) Trophic pyramid b) Ecosystem engineer c) Ecosystem service d) Trophic cascade which one?arrow_forwardWhich statement about energy flow in ecosystems is accurate? A.Energy flow reaches an equilibrium within ecosystems such that every trophic level has the same amount of energy. B. Because forests have relatively few large trees which support numerous smaller organisms, they have less energy at the lowest trophic level than at higher trophic levels. C. Energy is recycled within ecosystems, moving from producers to consumers to decomposers and back to producers. D. Energy flows through ecosystems with some lost at every transition resulting in lower trophic levels always containing more energy than higher trophic levels. E. Aquatic ecosystems have more energy at higher trophic levels than at lower trophic levels, whereas terrestrial ecosystems have more energy at lower trophic levels. Please answer asap and type your answer and do not copy from anywhere pleasearrow_forwardAs a general rule, how much energy is lost in the transmission of energy from one trophic level to the one immediately above it? a. 1% b. 10% c. 90% d. 50%arrow_forward
- As energy is transferred from one trophic level to the next, substantial amounts of energy are lost to/asa. undigestible biomass.b. heat.c. metabolism.d. All of the above.arrow_forwardHow would you describe the trophic levels in a typical ecosystem? Discuss the flow of energy through the ecosystem, the relationship between the different trophic levels, and the factors that limit the number of trophic levels.arrow_forwardWhat does each pie slice represent? a. Amount of energy available to support each trophic level b. Amount of energy that can be converted to biomass at a higher trophic level c. Amount of energy available from the sun d. Inefficiency of energy flow from one trophic level to the nextarrow_forward
- “The pyramid of energy is always upright” states that A)The energy conversion efficiency of herbivores is better than carnivores. B)The energy conversion efficiency of carnivores is better than herbivores C)Producers have the lowest energy conversion efficiency D)Energy conversion efficiency is the same in all trophic levelsarrow_forwardAt which point in the trophic pyramid is the greatest arount (not percentage) of energy lost? A) Between the primary producers and the primary consumers B) Between the primary consumers and the secondary consumers C)Between the secondary consumers and the tertiary consumers D) Between the secondary consumers and the primary producersarrow_forwardWhich of the following are important biotic factors that can affect the structure and organization of an ecosystem? A)temperature, water B)nutrient availability, soil pH C)predation, competition D)precipitation, wind E)light intensity, seasonalityarrow_forward
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