Texas Agricultural Weed Control Exam
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1. What is the primary goal of weed management?
A. Eliminate all plants
B. Increase soil erosion
C. Reduce weed competition with crops
D. Increase weed diversity
Answer: C
Weed control focuses on reducing competition for water, nutrients,
light, and space.
2. Which weed life cycle completes in one growing season?
A. Biennial
B. Annual
C. Perennial
D. Woody
Answer: B
Annual weeds germinate, grow, reproduce, and die within one
season.
3. Which life cycle requires two years to complete?
A. Annual
B. Perennial
C. Biennial
D. Winter annual
Answer: C
,Biennials produce vegetative growth the first year and flower the
second.
4. Which structure allows perennial weeds to spread underground?
A. Seeds
B. Stolons
C. Rhizomes
D. Leaves
Answer: C
Rhizomes are underground stems that allow vegetative spread.
5. Which method controls weeds before they emerge?
A. Postemergence herbicide
B. Preemergence herbicide
C. Mechanical tillage only
D. Biological control
Answer: B
Preemergence herbicides prevent germination or early growth.
6. What is herbicide selectivity?
A. Killing all plants equally
B. Affecting weeds but not crops
C. Only killing grasses
D. Only working in dry soil
Answer: B
Selective herbicides target weeds without harming desirable plants.
7. Which factor most affects herbicide drift?
, A. Soil texture
B. Wind speed
C. Crop type
D. Fertility
Answer: B
Wind increases the chance of spray particles moving off target.
8. What is the recommended wind speed for spraying?
A. 0 mph
B. 3–10 mph
C. 15–20 mph
D. Above 20 mph
Answer: B
Light, steady wind reduces drift and improves deposition.
9. Which weed control method involves crop rotation?
A. Mechanical
B. Cultural
C. Chemical
D. Biological
Answer: B
Cultural practices improve crop competitiveness and reduce weed
pressure.
10. Which type of herbicide kills only grasses?
A. Broadleaf herbicide
B. Nonselective herbicide
C. Grass-selective herbicide
D. Soil sterilant
Review with Answers and Rationales | 100%
Pass Guaranteed | Graded A+
1. What is the primary goal of weed management?
A. Eliminate all plants
B. Increase soil erosion
C. Reduce weed competition with crops
D. Increase weed diversity
Answer: C
Weed control focuses on reducing competition for water, nutrients,
light, and space.
2. Which weed life cycle completes in one growing season?
A. Biennial
B. Annual
C. Perennial
D. Woody
Answer: B
Annual weeds germinate, grow, reproduce, and die within one
season.
3. Which life cycle requires two years to complete?
A. Annual
B. Perennial
C. Biennial
D. Winter annual
Answer: C
,Biennials produce vegetative growth the first year and flower the
second.
4. Which structure allows perennial weeds to spread underground?
A. Seeds
B. Stolons
C. Rhizomes
D. Leaves
Answer: C
Rhizomes are underground stems that allow vegetative spread.
5. Which method controls weeds before they emerge?
A. Postemergence herbicide
B. Preemergence herbicide
C. Mechanical tillage only
D. Biological control
Answer: B
Preemergence herbicides prevent germination or early growth.
6. What is herbicide selectivity?
A. Killing all plants equally
B. Affecting weeds but not crops
C. Only killing grasses
D. Only working in dry soil
Answer: B
Selective herbicides target weeds without harming desirable plants.
7. Which factor most affects herbicide drift?
, A. Soil texture
B. Wind speed
C. Crop type
D. Fertility
Answer: B
Wind increases the chance of spray particles moving off target.
8. What is the recommended wind speed for spraying?
A. 0 mph
B. 3–10 mph
C. 15–20 mph
D. Above 20 mph
Answer: B
Light, steady wind reduces drift and improves deposition.
9. Which weed control method involves crop rotation?
A. Mechanical
B. Cultural
C. Chemical
D. Biological
Answer: B
Cultural practices improve crop competitiveness and reduce weed
pressure.
10. Which type of herbicide kills only grasses?
A. Broadleaf herbicide
B. Nonselective herbicide
C. Grass-selective herbicide
D. Soil sterilant
