Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 56, Problem 4TYK
Summary Introduction
Introduction:
In the higher trophic levels of a food chain, sometimes there is an increase in the concentration of a particular substance/molecule which could be harmful to the organisms of that trophic level. The substances could be DDT, mercury, and pesticides. They enter the organism through the food, air, and water.
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Chapter 56 Solutions
Biological Science
Ch. 56 - Ture of false? An ecosystem comprises a community...Ch. 56 - Which of the following ecosystems would you expect...Ch. 56 - Which of the following is normally the...Ch. 56 - Prob. 3TYKCh. 56 - Devegetation has what effect on ecosystem...Ch. 56 - Prob. 4TYKCh. 56 - Prob. 7TYUCh. 56 - Explain why decomposition rates in a field in...Ch. 56 - Why are the open oceans nutrient poor? Why are...Ch. 56 - Prob. 8TYU
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- Which statement best explains why persistent, fat-solublechemicals such as methylmercury accumulate in the highesttrophic levels?a. Animals at the highest trophic levels eat the lowest-quality food.b. The amount of biomass increases in each trophic level, and largeorganisms accumulate the most methylmercury.c. Large organisms are often herbivores, so they would consumemethylmercury directly.d. Methylmercury does not leave an animal’s body; each predatortherefore consumes the mercury contained in many prey.arrow_forwardwhat organism would be most affected by a blightr that eliminates all plant material from an ecosystem? a. hetertrophic marine decomposers b. hetertrophic soil decomposers c. chemolithoautotrophs d. oxygenic microbial phototreophs e.anoxygenic microbial phototreophsarrow_forwardcan someone please help me to answer questions a-b thank you 1In a trophic pyramid, each level is smaller than the one below. a) What does the size of each level represent? b) How much energy is transferred from level to level? c) Explain why the levels get smaller as the trophic pyramid goes up.arrow_forward
- What is one of the primary benefits of bioremediation? Group of answer choices A. to improve human health with the help of living organisms such as bacteria B. to clean up areas polluted with toxic compounds by using bacteria C. to improve soil quality for plant growth by using bacteria D. to improve bacteria for production of useful chemicalsarrow_forwardConsider figure 49.8 in the textbook. Note the red versus blue squares and the red versus blue bars in the graph. Please choose all applicable options. a.The difference in color (red versus blue) corresponds to a difference in an abiotic factor. b.The difference in color intensity (dark red versus light red) corresponds to a difference in a biotic factor. c.The difference in color (red versus blue) corresponds to a difference in a biotic factor. d.The difference in color intensity (dark red versus light red) corresponds to a difference in an abiotic factor.arrow_forwardWhat is a major primary producer in many aquatic biomes?a. Underwater plantsb. The sunc. Phytoplanktond. Insect larvaearrow_forward
- Why are phytoplankton commonly referred to as primary producers? O A. They are decomposers that return nutrients to the ecosystem. B. They are autotrophs relied upon directly or indirectly by the rest of the marine biome. O C. They are heterotrophs that prey on parasites. D. They exist in forests where other produce grows. 5 of 10 Answered MacBook Air F4 @ $4 & 2 3 4 5 6 7 Q E R Y A S D F Garrow_forwarda. 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?arrow_forwardWhich of the following would not be included in a description of an organism’s niche? a. its trophic level b. the humidity and temperature it prefers c. when it reproduces d. its number of chromosomesarrow_forward
- Anthropogenic activities have increased the amount of biologically-active nitrogen in ecosystems by: O a, b, and c are correct O both b and c are correct a. burning fossil fuels c. using industrial processes to create nitrogen fertilizer by fixing atmospheric nitrogen O b. planting clover, soybeans, and other nitrogen-fixing cropsarrow_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_forwardFigure 20.12 Which of the following statements about the nitrogen cycle is false? a. Ammonification converts organic nitrogenous matter from living organisms into ammonium (NH4+) . b. Denitrification by bacteria converts nitrates (NO3) to nitrogen gas (N2) . c. Nitrification by bacteria converts nitrates (NO3) to nitrites (NO2) . d. Nitrogen fixing bacteria convert nitrogen gas (N2) into organic compounds.arrow_forward
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