Agronomy MCQs – Set 09 (Weed Management)
Agronomy MCQs – Set 09 (Weed Management)
Q1. A weed is defined as:
A) A useful plant
B) A plant growing where it is not wanted
C) A cultivated plant
D) A medicinal plant
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Correct Answer: A plant growing where it is not wanted
Q2. Critical period of weed competition refers to:
A) Entire crop growth period
B) Period when weeds must be controlled to prevent yield loss
C) Period after harvest
D) Only vegetative stage
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Correct Answer: Period when weeds must be controlled to prevent yield loss
Q3. Weeds cause maximum damage mainly by:
A) Releasing toxins
B) Competing for nutrients, water and light
C) Increasing soil fertility
D) Acting as host for insects only
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Correct Answer: Competing for nutrients, water and light
Q4. Which weed reproduces mainly by vegetative means?
A) Chenopodium album
B) Cyperus rotundus
C) Amaranthus spp.
D) Phalaris minor
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Correct Answer: Cyperus rotundus
Q5. The most common method of weed control in India is:
A) Chemical method
B) Biological method
C) Mechanical method
D) Cultural method
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Correct Answer: Mechanical method
Q6. Hand weeding is an example of:
A) Cultural method
B) Mechanical method
C) Chemical method
D) Biological method
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Correct Answer: Mechanical method
Q7. Which cultural practice helps in weed control?
A) Proper spacing and crop rotation
B) Excess irrigation
C) Late sowing
D) Poor seed quality
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Correct Answer: Proper spacing and crop rotation
Q8. Chemical weed control uses:
A) Insects
B) Pathogens
C) Herbicides
D) Machines
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Correct Answer: Herbicides
Q9. Which herbicide is used as pre-emergence?
A) 2,4-D
B) Paraquat
C) Atrazine
D) Glyphosate
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Correct Answer: Atrazine
Q10. 2,4-D is selective against:
A) Grassy weeds
B) Broad-leaved weeds
C) Sedges
D) All weeds
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Correct Answer: Broad-leaved weeds
Q11. Glyphosate is a:
A) Selective herbicide
B) Pre-emergence herbicide
C) Non-selective herbicide
D) Contact herbicide
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Correct Answer: Non-selective herbicide
Q12. Paraquat is a:
A) Systemic herbicide
B) Contact herbicide
C) Residual herbicide
D) Selective herbicide
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Correct Answer: Contact herbicide
Q13. Which method gives long-term weed control?
A) Mechanical
B) Chemical
C) Cultural
D) Integrated weed management
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Correct Answer: Integrated weed management
Q14. Integrated weed management means:
A) Use of only herbicides
B) Use of only manual methods
C) Combination of different weed control methods
D) No weed control
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Correct Answer: Combination of different weed control methods
Q15. Which weed is most problematic in wheat crop?
A) Echinochloa crus-galli
B) Phalaris minor
C) Cyperus rotundus
D) Amaranthus spp.
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Correct Answer: Phalaris minor
Q16. The critical period of weed competition in most crops lies between:
A) 0–10 DAS
B) 15–45 DAS
C) 60–90 DAS
D) Entire crop period
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Correct Answer: 15–45 DAS
Q17. Biological weed control uses:
A) Herbicides
B) Machines
C) Natural enemies
D) Fertilizers
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Correct Answer: Natural enemies
Q18. Which aquatic weed is controlled by fish?
A) Eichhornia
B) Hydrilla
C) Salvinia
D) Lemna
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Correct Answer: Hydrilla
Q19. Herbicide resistance develops due to:
A) Excess fertilizer use
B) Repeated use of same herbicide
C) Proper crop rotation
D) Manual weeding
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Correct Answer: Repeated use of same herbicide
Q20. Best weed management practice is to:
A) Depend on herbicides only
B) Avoid weed control
C) Use integrated approach
D) Use mechanical methods only
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Correct Answer: Use integrated approach
