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Agriculture Exams (Agri Croppro) – Page 15

#281. The early definitions of a virus mentioned which of the following characteristic?
A as obligate parasites
B possession of RNA as genome
C smaller than the pore size of bacterial filters
D cause mosaic symptoms
Answer: smaller than the pore size of bacterial filters
#282. The virus capsid are made up of subunits called
A polypeptides
B capsomeres
C coat proteins
D amino acids
Answer: capsomeres
#283. DNA and RNA are the two types of nucleiç acids in viruses. These nucleic acids can best be differentiated on which of the following?
A nitrogen bases
B phosphate groups
C length
D sequence
Answer: nitrogen bases
#284. The main components of plant viruses are
A DNA + glycoprotein + lipids
B Transfer RNA + protein + lipids
C glyconucleoprotein + lipids
D either DNA or RNA + protein
Answer: either DNA or RNA + protein
#285. The structural protein component of plant viruses is the one assembled to be the capsid while the nonstructural proteins are those that....
A protect the nucleic acid genome
B mediate replication of the genome
C determine the type of relationship with its vector
D protect another protein
Answer: mediate replication of the genome
#286. Which of the following mediates the synthesis of RNA from a viral RNA template?
A DNA dependent DNA polymerase
B DNA dependent RNA polymerase
C RNA dependent RNA polymerase
D RNA dependent DNA polymerase
Answer: RNA dependent RNA polymerase
#287. The study of the reaction of the antibody and antigen in vitro is called
A serology
B virology
C Immunology
D Hematology
Answer: Hematology
#288. Which of the following fungus is not known to include species as vectors of plant viruses?
A Olpidium spp.
B Phytophthora spp.
C Spongaspora spp.
D Plasmodiophora spp.
Answer: Phytophthora spp.
#289. With the use of insecticides to control a persistently transmitted plant virus, the following is/are not expected effect/s
A reduction of total inoculum
B reduction of disease spread
C reduction of total insect vector population
D no reduction of disease spread
Answer: no reduction of disease spread
#290. A persistently transmitted virus
A induces foliar symptoms such as mosaic, stunting or dwarfing
B is lost by the vector after a few seconds to minutes of vector probing/feeding
C usually has no latent period
D has a long latent period
Answer: has a long latent period
#291. A virus that does not persist in its insect vector
A infects specialized cells such as those in the vascular system
B is transmitted after several hours to a few days of vector probing/feeding
C is not lost after molting of the vector
D is lost after molting of the vector
Answer: is lost after molting of the vector
#292. Integrated Pest Management does not encourage
A Combination of two or more control measures
B Optimization of control methods
C Utilization of natural mortality factors
D Frequent, non-judicious use of pesticides
Answer: Frequent, non-judicious use of pesticides
#293. Refers to the ability to endure pest attack without suffering from significant loss of yield.
A tolerance
B antibiosis
C non-preference
D hypersensitive
Answer: tolerance
#294. Pest control method that includes tactics causing pests to contribute to the destruction of their own species.
A Autocidal Control
B Biological Control
C Behavioral Control
D Genetic control
Answer: Autocidal Control
#295. It is a type of host resistance where insects exhibit abnormal development when they feed on resistant host.
A Tolerance
B Antibiosis
C Horizontal resistance
D Non-preference
Answer: Antibiosis
#296. Refers to the control of pest by living organisms under either natural or artificial circumstances.
A Cultural Control
B Biological Control
C Behavioral Control
D mechanical control
Answer: Biological Control
#297. Refers to pest whose population equilibrium is always above the economic threshold level.
A Key pests
B Occasional pests
C Potential pests
D Minor pests
Answer: Key pests
#298. Refers to the level of pest population or injury, which indicates potential danger.
A Economic Threshold Level
B Economic Injury Level
C Warning Threshold Level
D Action Threshold Level
Answer: Warning Threshold Level
#299. Principle of crop protection where the host is manipulated to resist pest attack.
A Protection
B Host evasion
C Immunization
D Avoidance
Answer: Immunization
#300. Interaction between two organisms where both are adversely affected is called
A competition
B amensalism
C symbiosis
D parasitism
Answer: competition
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