Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 24, Problem 6SQ
Summary Introduction
Introduction: An ecosystem is defined as a biological community, wherein living organisms interact with one another and with the nonliving components around them. It may include one or more than one community. Producers, consumers, and decomposers are the three main groups in the ecosystem.
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The total amount of energy taken up by producers through photosynthesis in an ecosystem is known as...?
Group of answer choices
a. evaporation
b. net primary production
c. standing crop
d. nutrient limitation
e. gross primary production
Forest trees have trunks, branches, and big roots, contributing to large amounts of total biomass. Grasslands have comparatively less biomass, but have a larger net primary production than that of forests. Why is this so?
A. Less respiration is needed in the forest habitat
B. More biomass is added in a grassland in the same time as that of forests
C. The number of consumers within the forest is greater
D. Solar energy is converted to chemical energy at a much higher rate in forests
1) A scientist finds that the gross primary productivity of the grasslands of the central United States is 55 g / m2 / year.
If the respiration loss is 33 g / m2 / year, what is the net primary productivity?
a) subtraction from gross productivity and respiration.b) The same as primary productivity.c) The value of respiration.d) The sum of gross primary productivity and respiration.
Chapter 24 Solutions
Human Biology (MindTap Course List)
Ch. 24 - Prob. 1RQCh. 24 - Prob. 2RQCh. 24 - Prob. 3RQCh. 24 - Prob. 4RQCh. 24 - Describe the reservoirs and organisms involved in...Ch. 24 - Prob. 1SQCh. 24 - Prob. 2SQCh. 24 - ________ is the study of how organisms interact...Ch. 24 - Prob. 4SQCh. 24 - A feeding relationship that proceeds from algae to...
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- Chemical fertilizers: a. supplement carbon fixation by crops. b. cause eutrophication. c. provide additional nitrogen for crops. d. provide additional phosphorous for crops. e. Only b. c. and d.arrow_forwardIn most ecosystems, the primary producers use energy from______ to build organic compounds. a. sunlight b. heat c. breakdown of wastes and remains d. breakdown of inorganic substances in the habitatarrow_forwardDeforestation ______. a. increases mineral runoff from soil b. decreases local temperature c. increases local rainfall d. all of the abovearrow_forward
- Primary productivity on land is affected by _______. a. nutrient availability c. temperature b. amount of sunlight d. all of the abovearrow_forwardThe producer in an ocean grazing food web is usually a _____. a. plant b. animal c. fungi d. planktonarrow_forwardThe deepest, richest soil in the world occurs in (a) temperate rain forest (b) tropical rain forest (c) savanna (d) temperate grassland (e) chaparralarrow_forward
- The total dry weight of plant material in a forest is a measure of the forests: a. gross primary productivity. b. net primary productivity. c. cellular respiration. d. standing crop biomass. e. ecological efficiency.arrow_forwardWhich 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_forwardSoil in _______ is richest in carbon. a. the arctic b. the tropics c. temperate zonesarrow_forward
- Netprimary productivity is the primary productivity of an ecosystem, aftersubtracting energy lost in:a.dead plant tissues.b.inedible plant tissues.c.respiration by primary producers.d.respiration by primary consumers.e.inefficiencies of photosynthesis.arrow_forwardWhich of the following natural resources humans gain from plants is the LEAST renewable? a) Peat b) Coal c) Wood d) Fruit e) A and B are equally non-renewablearrow_forwardWhy is the destruction of tropical forests so devastating?A. Tropical forests are considered a non-renewable resource due to the amountof time it takes for reforestation to occur.B. Tropical forests cover much less of the surface of the earth than other types offorests and are eliminated faster as a result.C. Tropical forests contain the habitats of the vast majority of life on earth. D. Tropical forests are the primary source of income for many corporations andbusinesses. Why has food production increased despite a net degradation in soil?A. The productivity of the land being used has increased, so more food is beingproduced.B. The widespread use of fertilizers enables more food to be grown than inprevious years.C. Many countries have programs that reward farmers who practice soilconservation techniques.D. Farmers are developing more cropland from wilderness areas now comparedto the past.arrow_forward
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