BIOLOGY VOL. II
16th Edition
ISBN: 9781308795317
Author: Raven
Publisher: Mcgraw-Hill/Create
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Chapter 38, Problem 1S
Summary Introduction
To explain:
The short term and long term consequences of fumigation on the soils, which is done to kill harmful
Introduction:
In farming, the crops are prevented from developing the diseases by spraying various kinds of antimicrobial products. These antimicrobials kill bacteria, fungi and other animals which causes harm to the crops.
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All of the following are true about soil microorganismsEXCEPT:(a) They never affect or change the physical characteristicsof their soil microenvironment.(b) They are considered to be a part of the soil.(c) All major microbial taxonomic groups can be found insoil (bacteria, fungi, algae, protists, viruses).(d) Species of the genus Clostridium contain important hu-man pathogens found in soil.(e) They are important as decomposers in the carbon andnitrogen cycles.
To 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 above
What unique stresses does a microorganism on a leaf contend with that a microbe in the soil does not?
Chapter 38 Solutions
BIOLOGY VOL. II
Ch. 38 - Which of the following is NOT found in topsoil? a....Ch. 38 - Prob. 2UCh. 38 - What proportion of the soil volume is occupied by...Ch. 38 - Which of the following is a micronutrient? a....Ch. 38 - Prob. 5UCh. 38 - Prob. 6UCh. 38 - a C4 plant, the Calvin cycle occurs in a. the...Ch. 38 - One potential problem with using poplars to remove...Ch. 38 - Prob. 1ACh. 38 - If you wanted to conduct an experiment to...
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- What are some factors which may limit the accurate study of soil microorganisms?arrow_forwardHow would green manure and soil microorganisms work together in enhancing soil fertility and crop yield? Name the targeted element and TWO (2) additional benefits brought by green manures to the soil?arrow_forwardBlack spot fungus is a disease that is known to attack roses in humid climates. At first, small black spots appear on the leaves. If left untreated, the entire plant can die. From this information, what is mostly the main cause of the demise? a) The plants’ cells are unable to carry out aerobic respiration. b) The leaves are unable to manufacture enough sugar to maintain the health of the plant. c) The roots are unable to absorb enough water. d) The stems are unable to support the plant.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_forwardYou have discovered a secondary metabolite made by an unusual fungus that has great industrial potential. Unfortunately, the fungus makes very little of this product, so you must develop a scheme to increase the yield. Can you think of using a technique that might be useful to enhance the productivity of that secondary metabolite?arrow_forwardMicronutrient deficiency is, or may be:Group of answer choices A.) pH dependent B.) affected by excess macro and secondary nutrients. C.) Is not as typical in acidic soil environments as in alkaline soil environments. D.) All of the abovearrow_forward
- Explant can be aa) Cut part of the plant used in tissue cultureb) Plant extract used in tissue culturec) Source of growth regulators added to mediad) Solidifying agentarrow_forwardSoil microorganisms, collectively referred to as dizotrophs, fix 90% of the inert nitrogen gas to ammonium and nitrate. There are two-main types of nitrogen-fixing bacteria: free-living (nonsymbiotic) and mutualistic (symbiotic). Describe the mutualistic relationship between Rhizobium and legumes. What is the advantage of using legumes as a cover crop in agricultural systems? A point of interest is that the nitrogenase enzyme complex is highly sensitive to oxygen. This is a major problem for free-living aerobic species such as cyanobacteria and species of the genera Azotobacter and Beiigrinckia. Describe two ways the bacteria can overcome to levels of oxygen in their cells.arrow_forwardWhat is soil pollution?Suggest various ways to prevent soil pollution?arrow_forward
- Which region of soil is the most microbially active?arrow_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_forwardThe growth of plants requires microbes. Describe what microbes are most critical for soil-bound plants and how agriculture uses chemicals to support the growth of these microbes.arrow_forward
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