Soil Fumigation Examination Questions and
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the primary purpose of soil fumigation?
A. Increase soil nutrients
B. Control soil-borne pests and pathogens
C. Improve soil texture
D. Reduce irrigation needs
Answer: B
Rationale: Soil fumigation is used mainly to eliminate soil-borne pests,
weeds, and disease-causing organisms.
2. Which pests are most commonly targeted by soil fumigants?
A. Birds and rodents
B. Nematodes, fungi, and weed seeds
C. Insects on plant leaves
D. Aquatic pests
,Answer: B
Rationale: Soil fumigants primarily control nematodes, soil fungi,
insects, and weed seeds.
3. Soil fumigants are best described as:
A. Contact insecticides
B. Systemic fertilizers
C. Volatile chemicals that penetrate soil
D. Organic compost materials
Answer: C
Rationale: Fumigants are volatile chemicals that diffuse through soil as
gases.
4. Why is soil sealing (tarps or films) used after fumigation?
A. To improve soil drainage
B. To prevent fumigant escape
C. To increase sunlight absorption
D. To cool the soil
,Answer: B
Rationale: Sealing traps the fumigant in the soil for effective pest
control.
5. Which environmental factor most affects fumigant movement in
soil?
A. Soil color
B. Soil temperature
C. Soil pH only
D. Wind speed above ground
Answer: B
Rationale: Temperature influences volatilization and movement of
fumigants.
6. Soil moisture in fumigation should generally be:
A. Completely dry
B. Saturated
C. At field capacity
D. Frozen
, Answer: C
Rationale: Field capacity moisture allows optimal fumigant distribution.
7. Which gas is commonly used as a soil fumigant?
A. Oxygen
B. Carbon dioxide
C. Methyl bromide
D. Nitrogen
Answer: C
Rationale: Methyl bromide is a widely known soil fumigant (though
restricted in many regions).
8. Soil fumigation works mainly by:
A. Freezing pests
B. Starving pests
C. Poisoning pests through gas exposure
D. Increasing soil salinity
Answer: C
Rationale: Fumigants act as toxic gases that penetrate and kill pests.
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the primary purpose of soil fumigation?
A. Increase soil nutrients
B. Control soil-borne pests and pathogens
C. Improve soil texture
D. Reduce irrigation needs
Answer: B
Rationale: Soil fumigation is used mainly to eliminate soil-borne pests,
weeds, and disease-causing organisms.
2. Which pests are most commonly targeted by soil fumigants?
A. Birds and rodents
B. Nematodes, fungi, and weed seeds
C. Insects on plant leaves
D. Aquatic pests
,Answer: B
Rationale: Soil fumigants primarily control nematodes, soil fungi,
insects, and weed seeds.
3. Soil fumigants are best described as:
A. Contact insecticides
B. Systemic fertilizers
C. Volatile chemicals that penetrate soil
D. Organic compost materials
Answer: C
Rationale: Fumigants are volatile chemicals that diffuse through soil as
gases.
4. Why is soil sealing (tarps or films) used after fumigation?
A. To improve soil drainage
B. To prevent fumigant escape
C. To increase sunlight absorption
D. To cool the soil
,Answer: B
Rationale: Sealing traps the fumigant in the soil for effective pest
control.
5. Which environmental factor most affects fumigant movement in
soil?
A. Soil color
B. Soil temperature
C. Soil pH only
D. Wind speed above ground
Answer: B
Rationale: Temperature influences volatilization and movement of
fumigants.
6. Soil moisture in fumigation should generally be:
A. Completely dry
B. Saturated
C. At field capacity
D. Frozen
, Answer: C
Rationale: Field capacity moisture allows optimal fumigant distribution.
7. Which gas is commonly used as a soil fumigant?
A. Oxygen
B. Carbon dioxide
C. Methyl bromide
D. Nitrogen
Answer: C
Rationale: Methyl bromide is a widely known soil fumigant (though
restricted in many regions).
8. Soil fumigation works mainly by:
A. Freezing pests
B. Starving pests
C. Poisoning pests through gas exposure
D. Increasing soil salinity
Answer: C
Rationale: Fumigants act as toxic gases that penetrate and kill pests.
