Plant Pathology Solved MCQs

1.

The most used methods for exclusion of the pathogens are..?

A. Chemical measures.
B. Regulatory measures.
C. Biological measures.
D. Mechanical measures.
Answer» B. Regulatory measures.
2.

The methods of control based on the principales of directly attacking the pathogens is/are..?

A. Avoiding the contact between the pathogen and host.
B. Plant and field sanitation for reduction of inoculum.
C. Destruction of parasite if it superficially present.
D. All of the above.
Answer» D. All of the above.
3.

Avoiding the contact between the pathogen and host wouldn’t include..?

A. Quarantine regulations.
B. Notification of plant disease.
C. Eradication.
D. Certification.
Answer» C. Eradication.
4.

Quarantine regulations are enforced by..?

A. A country.
B. A state.
C. A state or country through legislation.
D. None of any option.
Answer» C. A state or country through legislation.
5.

The quarantine regulations anticipate…?

A. That the disease or pathogen is not present in the country.
B. That the disease or pathogen may be present in the country.
C. Both a and b.
D. None of the above.
Answer» A. That the disease or pathogen is not present in the country.
6.

Certification is the method of management of pathogen..?

A. Eradication.
B. Field sanitation.
C. Protective application of synthetic toxic chemicals.
D. Avoiding the contact between the pathogen and the host.
Answer» D. Avoiding the contact between the pathogen and the host.
7.

Which is true about certification?
1.As far as possible only seeds certified as pathogen free are allowed to enter the country.
2.Other planting materials can be allowed to enter the country without certification.
3.Quarantine is needed for the seeds from foreign countries while it is certified.
4.Quarantine is not needed for the seeds from foreign countries while it is certified.
5.Is meant to prevent existing pathogens.
6.Isn’t meant to prevent existing pathogens.

A. 2, 4 and 5 are true.
B. 1, 3 and 5 are true.
C. 1, 2, 3 and 6 are true.
D. All are true.
Answer» B. 1, 3 and 5 are true.
8.

…. will require education of the farmers?

A. Quarantine.
B. Prevention and sale of plant disease.
C. Certification.
D. Notification of the plant disease.
Answer» D. Notification of the plant disease.
9.

Theoretically …. is the most effective approach to keep pathogens away from the area?

A. Eradication.
B. Field sanitation.
C. Exclusion.
D. All of the above.
Answer» C. Exclusion.
10.

SAR stands for…?

A. Systemic Acquired Resistant.
B. Sequence Acquired Resistant.
C. System Acquired Resistance.
D. Sequence Acquired Resistance.
Answer» A. Systemic Acquired Resistant.
11.

SAR is approached through..?

A. Biological means.
B. Physical means.
C. Both a and b.
D. Chemical and transgenic means.
Answer» C. Both a and b.
12.

Which is not a type of eradication?

A. Eradication of seed-borne inoculum.
B. Eradication of alternative hosts.
C. Eradication of diseased plant or parts.
D. All are true.
Answer» D. All are true.
13.

The eradication methods of sieving, steeping in brine are..?

A. Biological method.
B. Physical method.
C. Mechanical method.
D. Chemical method.
Answer» B. Physical method.
14.

The internally seed-borne infection can be destroyed by..?

A. Hot water treatment.
B. Solar energy treatment.
C. Use of selected antibiotics and systemic fungicides.
D. All of the above.
Answer» D. All of the above.
15.

The plant and field sanitation for reduction of inoculum anticipates..?

A. Pathogen has entered the area and has established itself in the fields.
B. Pathogen has yet to enter the area and has to establish itself in the fields.
C. Pathogen has not entered the area and has not established itself in the fields.
D. None of the above.
Answer» A. Pathogen has entered the area and has established itself in the fields.
16.

The eradication of plant disease means..?

A. Plant hygiene envisages the removal of diseased parts.
B. Removal of entire plants from the vicinity of the healthy plants.
C. Both a and b.
D. None of the above.
Answer» C. Both a and b.
17.

The eradication of alternative hosts is done..?

A. To prevent the perpetuation of the host.
B. To prevent the perpetuation of the pathogen.
C. To prevent the spread of the disease.
D. Both b and c.
Answer» D. Both b and c.
18.

The field sanitation practice may include..?

A. Hot weather deep ploughing.
B. Use of chemicals to disinfect the fallen plant debris.
C. Rotation, flooding, organic amendments etc.
D. All of the above.
Answer» D. All of the above.
19.

The objective of field sanitation is..?

A. To completely destroy the source of infection present in the field.
B. Or partially destroy the source of infection present in the field.
C. Both a and b.
D. None of the above.
Answer» C. Both a and b.
20.

The protective application are undertaken with the assumption that..?

A. The entry of the pathogen can be avoided.
B. The entry of the pathogen can’t be avoided and is likely to appear through wind borne primary inoculum from a nearby source.
C. The entry of the pathogen can’t be avoided and is likely to appear through wind borne primary or secondary inoculum from a nearby source.
D. None of the above.
Answer» C. The entry of the pathogen can’t be avoided and is likely to appear through wind borne primary or secondary inoculum from a nearby source.
21.

The Wettable powder contains …. active ingredient?

A. 25 – 35%.
B. 45 – 50%.
C. 60 – 80%.
D. 40 – 60%.
Answer» C. 60 – 80%.
22.

The dusts formulation contains… active ingredient?

A. 10 -15%.
B. 4 – 10%.
C. 15 – 20%.
D. 25 – 40%.
Answer» B. 4 – 10%.
23.

Which is true about EC and fungicides..?

A. Fungicides are not commonly formulated as EC.
B. Fungicides are commonly formulated as EC.
C. Both a and b.
D. None of the above.
Answer» A. Fungicides are not commonly formulated as EC.
24.

The percentage of a.i. in granules is …. as compared to dusts formulation?

A. Equal.
B. Low.
C. High.
D. None of the above.
Answer» B. Low.
25.

Which is true about solutions?

A. Agitation is required after adding in water.
B. No agitation is required after adding in water.
C. a.i. are added in emulsifying agents and agitation is required.
D. a.i. are added in emulsifying agents and no agitation is required.
Answer» B. No agitation is required after adding in water.
26.

The percentage of a.i. in suspension is ..?

A. Higher than WP.
B. Lower than WP.
C. Similar to WP.
D. None of the above.
Answer» C. Similar to WP.
27.

Which is true about suspensions?

A. They are mixed with emulsifiers and require agitation.
B. They are mixed with water and require agitation.
C. They are mixed with emulsifiers and do not require agitation.
D. They are mixed with water and do not require agitation.
Answer» B. They are mixed with water and require agitation.
28.

Which is not a type of formulation of synthetic chemical?

A. Dusts.
B. Slurries.
C. Granules.
D. All are the formulations.
Answer» D. All are the formulations.
29.

Which is a type of material used for chemical control?

A. Spray material.
B. Dust material.
C. Soil and seed treatment material.
D. All of the above.
Answer» D. All of the above.
30.

Which is a spray material?

A. Fungicide as WP.
B. Insoluble powder.
C. Dry powder.
D. All of the above.
Answer» A. Fungicide as WP.
31.

The spray materials are used as..?

A. Soil surface protective material.
B. Plant surface protective material.
C. Both a and b.
D. None of the above.
Answer» B. Plant surface protective material.
32.

Dust materiales are use as..?

A. Soluble powders are used as soil surface protective material.
B. Soluble powders are used as plant surface protective material.
C. Insoluble powders are used as soil surface protective material.
D. Insoluble powders are used as plant surface protective material.
Answer» D. Insoluble powders are used as plant surface protective material.
33.

The seed treatment materiales are used as..?

A. Dry powders.
B. Dips.
C. Slurries.
D. All of the above.
Answer» D. All of the above.
34.

On the basis of their tenacity the seed treatment materials are of..?

A. 1 type.
B. 2 types.
C. 3 types.
D. 4 types.
Answer» B. 2 types.
35.

Which is not a type of seed treatment material..?

A. Seed disinfestans.
B. Seed protestants.
C. Seed coverers.
D. None of the above.
Answer» C. Seed coverers.
36.

Which is true about seed disinfestans..?

A. Disinfest the seed but do not remain active for long after seed has been planted.
B. Disinfest the seed and remain active for long after seed has been planted.
C. Both a and b.
D. None of the above.
Answer» B. Disinfest the seed and remain active for long after seed has been planted.
37.

Which is true about seed protectants?

A. Disinfest the seed but do not remain active for long after seed has been planted.
B. Disinfest the seed and remain active for long after seed has been planted.
C. Disinfest the seed and give temporary protection after seed has been planted.
D. Do not disinfest the seed and give temporary protection after seed has been planted.
Answer» C. Disinfest the seed and give temporary protection after seed has been planted.
38.

Consider about soil treatment chemicals..
1.Complete control of the plant disease is obtained.
2.Complete control of the plant disease is not obtained.
3.The fungal disease is suppressed by the chemical.
4.The fungus always killed by the chemical.
5.Nematicides destroy the nematodes but eggs escape.

A. Only 2, 3 and 5 are true.
B. Only 1, 3 and 4 are true.
C. Only 1, 2 and 5 are true.
D. All are true.
Answer» A. Only 2, 3 and 5 are true.
39.

Following points should be considered at the time of deciding about sue of soil treatment chemicals..?

A. Toxicity of the chemical to the crop.
B. Effectiveness of the chemical against a particular pathogen.
C. Possible stimulation of non-target parasites.
D. All of the above.
Answer» D. All of the above.
40.

PCNB (quintozone) is..?

A. Non persistent in soil.
B. Moderate persistent in soil.
C. High persistent in soil.
D. None of the above.
Answer» C. High persistent in soil.
41.

In present soil fumigants are of..?

A. 2 types.
B. 3 types.
C. 4 types.
D. 5 types.
Answer» A. 2 types.
42.

Which is an outdated type of soil fumigants..?

A. Biofumigants.
B. Mycofumigants.
C. Chemical fumigants.
D. None of the above.
Answer» C. Chemical fumigants.
43.

Which is true about soil fumigants..?

A. On a small scale the chemical is often applied to the soil which is then covered with polythene sheets for a specified time.
B. On a small scale the chemical is often applied to the soil which is then covered with polythene sheets for a non-specified time
C. On a large scale the soil surface may not be packed following the treatment.
D. The chemicals are applied a few days before planting.
Answer» A. On a small scale the chemical is often applied to the soil which is then covered with polythene sheets for a specified time.
44.

Which is true about soil fumigants..?

A. On a large scale the chemical is often applied to the soil which is then covered with polythene sheets for a specified time.
B. On a small scale the chemical is often applied to the soil which is then covered with water seal for a non-specified time
C. On a large scale the soil surface may be packed following the treatment.
D. The chemicals are applied a few days before planting.
Answer» C. On a large scale the soil surface may be packed following the treatment.
45.

The fungicidal pastes…?
1.Used in dressing of pruned surface of the tree.
2.Prepared by using copper sulphate plus lime.
3.Prepared by using copper carbonate plus red lead.
4.Lanoline is used as suitable adhesive.

A. Only 1 and 2 are true.
B. Only 1 and 3 are true.
C. Only 1, 2 and 3 are true.
D. All are true.
Answer» D. All are true.
46.

Which is an antibiotic used for plant protection?

A. Streptomycin.
B. Actidione.
C. Griseofulvin.
D. All of the above.
Answer» D. All of the above.
47.

Which is true about plant antibiotics?

A. Mostly used as spray materials.
B. Very low concentration is used.
C. Have systemic action.
D. All are true.
Answer» D. All are true.
48.

The systemic fungicides have..?

A. Curative effect.
B. Non curative effect.
C. Either a or b.
D. None of the above.
Answer» A. Curative effect.
49.

Which type of fungicide is potentially most effective and economical?

A. Soil fumigants.
B. Pastes.
C. Systemic fungicides.
D. Dust.
Answer» C. Systemic fungicides.
50.

A pathogen often develops resistant against..?

A. Systemic fungicides.
B. Dusts.
C. Pastes.
D. Fumigants.
Answer» A. Systemic fungicides.
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