Agricultural Microbiology Final Exam

PGPR can synthesize specific metabolites for the crops, such as ...

• IAA

• Cytokinin

• Gibberellin

• Phytate

• Lectin

PGPR can facilitate the nutrients absorption from the soil, it is called as

• Bioprotectant

• Biostimulant

• Biofertilizer

PGPR can inhibit or suppress pathogens from infecting the plant with these mechanisms ...

• Phytohormone productions

• Systemic induction of resilience to pests and pathogens

• Siderophore and antibiotic production

• Nutrition competition

• Nutrition availability

Which one are the advantages of biological control

• May need to release multiple times

• Already established around the crop

• Time consuming and labor intensive

• No human health and environmental hazard

• Expensive

Which one are the disadvantages of biological control

• May need to release multiple times

• Already established around the crop

• Time consuming and labor intensive

• No human health and environmental hazard

• Expensive

These are the characteristics of parasitoids ...

• Host specific

• Target one life stage

• Only immature stage is parasitic

• Generalist

• Alternative food resources

These are the characteristics of predators ...

• Ambulatory and aerial dispersal

• Feed on multiple life stages of the pest

• One or more life stages are predaceous

• Generalist

• Alternative food resources

Biological control agents can inhibit the following pathogens, except ...

• Bacterium

• Fungi

• Nematodes

• Viruses

• Nitrogen-fixing bacteria

These are the mechanisms of plant growth promoting microorganisms, except ...

• Enhancing plant growth and nutritional quality

• Disease suppression and antibiotic stress tolerance

• Biomass and biofuel production

• Bioremediation of contaminated and degraded lands

• Intensification of agricultural production and reducing crop losses

These are included into biofertilizers ...

• Bioherbicide

• Nitrogen-fixing microbes

• Phosphate solubilizing microbes

• Plant growth promoting bacteria

• Biofungicide