Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 46, Problem 12SQ
Summary Introduction
Concept introduction: Air is the main reservoir of nitrogen. About 80 percent of the atmosphere is the nitrogen gas. Atoms of phosphorus are highly reactive. Therefore, phosphorus does not occur naturally in its elemental form. Most of the earth’s phosphorus is bonded to oxygen molecule as phosphate (PO43-).
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Chapter 46 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 46 - In most ecosystems, the primary producers use...Ch. 46 - Organisms at the lowest trophic level in a...Ch. 46 - Prob. 3SQCh. 46 - Prob. 4SQCh. 46 - Efficiency of energy transfers in aquatic...Ch. 46 - Prob. 6SQCh. 46 - Earths largest carbon reservoir is _______. a. the...Ch. 46 - Carbon is released into the atmosphere by _____ a....Ch. 46 - Prob. 1DAACh. 46 - Prob. 2DAA
Ch. 46 - Changes in the Air To assess the impact of human...Ch. 46 - Changes in the Air To assess the impact of human...Ch. 46 - Prob. 9SQCh. 46 - The _____ cycle is a sedimentary cycle. a....Ch. 46 - Earths largest phosphorus reservoir is _______. a....Ch. 46 - Prob. 12SQCh. 46 - Nitrogen fixation converts _______ to _______. a....Ch. 46 - Prob. 14SQCh. 46 - Prob. 15SQCh. 46 - Marguerite plants a vegetable garden in Maine....Ch. 46 - Where does your drinking water come from? An...Ch. 46 - Scientists study bubbles trapped in ancient...Ch. 46 - Nitrogen-fixing bacteria live throughout the...Ch. 46 - As noted in Section 46.7, mycorrhizal fungi help...
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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_forwardWhat fraction of the soil represents the most active? A. Clay B. Pore spaces C. Humus D. Soil colloidsarrow_forwardThe practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Why would nitrogen-fixing plants be plowed under instead of harvested? a) To increases usable nitrogen in the soil. b) To increase water retention. c) Nitrogen-fixing plants are not a food crop. d) To decrease bacteria in the soil.arrow_forward
- Soil particles may be held together by which of the following to form aggregates? Group of answer choices a) Humus b) Clay c) Iron Oxides d) All of the above e. None of the abovearrow_forwardWhen mineral nutrients are applied to the soil, which of the following may occur?Group of answer choices a. Taken in by the plant b. Leached below the root zone c. Tied up to colloids in the soil d) All of the abovearrow_forwardPlants obtain ______ by taking it up from the air. a. nitrogen c. phosphorus b. carbon d. waterarrow_forward
- Soil in _______ is richest in carbon. a. the arctic b. the tropics c. temperate zonesarrow_forwardBased on temperature requirements which of the following is not correct?* a. Coconut and mango are tropical crops b. Asian rice and wheat are cool season crops c. Citrus species are sub-tropical crops d. Cruciferous vegetables are cool season cropsarrow_forwardTo acquire immobile nutrients, the root system must be:Group of answer choices A.)Actively growing B.) in an environment with adaquate available moisture C.) In an unsaturated soil environment D.) All of the abovearrow_forward
- Plants are a source of ________. a. food b. fuel c. medicine d. all of the abovearrow_forwardThe Casparian strip affectsa. how water and minerals move into the vascular cylinder.b. vascular tissue composition.c. how soil particles function.d. cation exchange.e. Both a and c are correct.arrow_forwardWhich of the following accurately describes life in soils? A: Soil food webs lack complexity compared to above-ground ecosystems. B: Soils contain both decomposers and predators that perform important functions. C: We would need to collect a large soil sample size to find many species. D: Soil biota sometimes support plants in taking up nutrients. E: B and D. F: B, C, and D.arrow_forward
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