NEW
Font size
WorksheetsAtmo-Ecosphere and Plant as Microbial Habitat - MicroCore RC
Total questions: 10
Worksheet time: 5mins
Generally, when the altitude increases, what happens to the atmospheric pressure, temperature, and concentration of available oxygen?
decrease, increase, decrease
decrease, decrease, decrease
increase, increase, increase
increase, decrease, increase
decrease, decrease, increase
Which of the following is not a way by which bioaerosols may form?
Splash from falling raindrops
Rapidly moving water currents
Forced air streams in sewage treatment plants
Spray from breaking waves
None of the aformentioned
Which of the following is not a reason why spores are better adapted in the atmosphere?
Metabolically active
Relatively of small size and low density
Produced in very high numbers
With protective structures
Which of the following is not a passive mechanism that discharge spores into the atmosphere?
Shedding under gravity
Ballistospore discharge
Rain splash
Shedding in convection currents
Mechanical disturbance
Which of the following is not a property of the environment that affects the dispersion of air spore in air currents?
Turbulence
Wind movement
Air viscocity
Degree of surface roughness
Pattern of atmospheric circulation
Which of the following can be observed by looking at the ratio of the number of microorganisms in the rhizosphere soil (R) to the number of corresponding microorganisms in soil remote from the roots (S) (R/S ratio)?
Allee's principle
Phytomicrobiome
Phyllosphere microflora
Rhizosphere effect
Which of the following factors does not affect the microbial community structure of the rhizosphere?
Plant phenotype
Exposure to disease-suppresive soil
Plant species
Root exudate composition
Plant developmental stage
Which of the following organisms does not belong to the most common bacteria on leaves?
Xanthomonas
Pseudomonas
Erwinia
Bacillus
Which of the following statements is true about the positive effects of soil microorganisms on plants?
Infected plants perceive pathogen invasion in roots or shoot and subsequently increase the secretion of microbe-stimulatory compounds in infected roots.
Plant microbiome assists in the weathering of minerals and but not the degradation of recalcitrant organic matter
Leghemoglobin buffers the concentration of free oxygen in the cytoplasm of infected plant cells to ensure the proper function of root nodules
Root exudates and other rhizodeposits stimulate and/or inhibit various microbes
Which of the following statements on the effect of plant growth-promoting bacteria and plants is not true?
Siderophores sequester iron which is used by the plant to produce chlorophyll. Iron-deficient plants have yellow leaves
Diazotrophs fix atmospheric nitrogen to form ammonia, nitrates, and sulfates, which are utilized by the plants
IAA is a plant growth-hormone which can be produced by PGPB and is important in regulating growth and developmental processes such as cell division and elongation
Phosphate-solubilizing bacteria play a critical role in soil by mineralizing organic P, solubilizing inorganic P minerals, and storing large amounts of P in biomass
