WATER & WEED MANAGEMENT

By Skumar

 

 WATER & WEED MANAGEMENT ICAR-PG

🌊 PART-A: WATER MANAGEMENT (15 MCQs)

Q1. Field capacity corresponds to soil moisture tension of

A. 0.1 bar
B. 0.33 bar
C. 1 bar
D. 15 bar

✅ Ans: B

Q2. Permanent wilting point occurs at

A. 0.33 bar
B. 1 bar
C. 10 bar
D. 15 bar

✅ Ans: D

Q3. Available soil water is

A. Saturation − FC
B. FC − PWP
C. PWP − hygroscopic water
D. Saturation − PWP

✅ Ans: B

Q4. Capillary water is

A. Unavailable
B. Available to plants
C. Hygroscopic
D. Gravitational

✅ Ans: B

Q5. Consumptive use of water includes

A. Evaporation
B. Transpiration
C. Metabolic use
D. All of the above

✅ Ans: D

Q6. Crop having highest water requirement

A. Wheat
B. Maize
C. Rice
D. Sorghum

✅ Ans: C

Q7. Most critical irrigation stage in wheat

A. Tillering
B. Jointing
C. CRI
D. Flowering

✅ Ans: C

Q8. IW/CPE ratio method is based on

A. Soil moisture
B. Crop stage
C. Atmospheric demand
D. Rainfall

✅ Ans: C

Q9. Highest application efficiency is in

A. Flood irrigation
B. Furrow irrigation
C. Sprinkler irrigation
D. Drip irrigation

✅ Ans: D

Q10. Duty of water means

A. Depth of irrigation
B. Area irrigated by unit discharge
C. Total rainfall
D. Crop duration

✅ Ans: B

Q11. Delta of crop refers to

A. Crop duration
B. Total irrigation depth
C. Root depth
D. Effective rainfall

✅ Ans: B

Q12. Waterlogging primarily affects

A. Photosynthesis
B. Root respiration
C. Transpiration
D. Nutrient uptake

✅ Ans: B

Q13. SAR is related to

A. Salinity hazard
B. Sodicity hazard
C. Soil texture
D. Drainage

✅ Ans: B

Q14. Gypsum is used to reclaim

A. Saline soil
B. Acid soil
C. Sodic soil
D. Peaty soil

✅ Ans: C

Q15. Water use efficiency is

A. Yield / rainfall
B. Yield / irrigation water
C. Yield / evapotranspiration
D. Yield / soil moisture

✅ Ans: C

🌿 PART-B: WEED MANAGEMENT (15 MCQs)

Q16. Weed is a plant

A. Grown intentionally
B. Undesirable & out of place
C. Medicinal
D. Forest species

✅ Ans: B

Q17. Most serious weed in wheat

A. Avena fatua
B. Phalaris minor
C. Chenopodium album
D. Parthenium

✅ Ans: B

Q18. Critical period of weed competition in rice

A. 0–15 DAS
B. 15–45 DAS
C. 45–60 DAS
D. After flowering

✅ Ans: B

Q19. Cyperus rotundus propagates mainly by

A. Seeds
B. Stolons
C. Rhizomes
D. Tubers

✅ Ans: D

Q20. Which is a sedge weed?

A. Phalaris minor
B. Echinochloa
C. Cyperus rotundus
D. Avena fatua

✅ Ans: C

Q21. 2,4-D controls

A. Grasses
B. Sedges
C. Broad-leaf weeds
D. All weeds

✅ Ans: C

Q22. Atrazine belongs to

A. Phenoxy
B. Triazine
C. Urea
D. Amide

✅ Ans: B

Q23. Glyphosate is

A. Selective
B. Pre-emergence
C. Non-selective
D. Contact

✅ Ans: C

Q24. Pendimethalin is applied as

A. Post-emergence
B. Pre-emergence
C. Directed spray
D. Soil fumigant

✅ Ans: B

Q25. Contact herbicides kill weeds by

A. Translocation
B. Root absorption
C. Destroying cell membranes
D. Enzyme inhibition

✅ Ans: C

Q26. Herbicide selectivity is due to

A. Differential absorption
B. Differential translocation
C. Differential metabolism
D. All of the above

✅ Ans: D

Q27. Continuous use of same herbicide causes

A. Weed shift
B. Herbicide resistance
C. Crop injury
D. Nutrient imbalance

✅ Ans: B

Q28. Parthenium causes

A. Yield loss
B. Skin allergy
C. Livestock toxicity
D. All of the above

✅ Ans: D

Q29. Integrated Weed Management includes

A. Cultural methods
B. Mechanical methods
C. Chemical methods
D. All of the above

✅ Ans: D

Q30. Smother crops are used for

A. Yield increase
B. Weed suppression
C. Soil reclamation
D. Pest control

✅ Ans: B

🧠 ONE-LOOK REVISION (Students LOVE THIS)

✔ FC = 0.33 bar | PWP = 15 bar
✔ CRI stage → Wheat
✔ Highest water need → Rice
✔ Phalaris → Wheat
✔ Cyperus → Sedge (tubers)
✔ 2,4-D → Broad-leaf weeds


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