4. Weeds

*नोट: यह सेक्शन रिवीजन के लिए है। अपना ज्ञान परखने के लिए ऊपर दिए गए क्विज़ में भाग लें।

1. What is the definition of a Weed?
   A) Desired plants  |  B) Plants growing in unwanted place and time  |  C) Ornamental plants  |  D) Medicinal plants
2. Growing of Prickly poppy in a mustard field is which type of weed?
   A) Absolute  |  B) Mimicry  |  C) Satellitic (Mimicry)  |  D) Voluntary
3. What is the scientific name of 'Bathua'?
   A) Chenopodium album  |  B) Cyperus rotundus  |  C) Avena fatua  |  D) None
4. Which is an example of a Monocot weed?
   A) Bathua  |  B) Nut grass (Motha)  |  C) Hirankhuri  |  D) Krishnanil
5. Example of a Biennial weed is:
   A) Chicory (Kasni)  |  B) Motha  |  C) Doob grass  |  D) Cuscuta
6. What is the maximum loss caused by weeds to crops?
   A) Changing color  |  B) Competition for nutrients, moisture, and space  |  C) Only water  |  D) Seed rotting
7. Cuscuta (Amarbel) is what type of weed?
   A) Root parasite  |  B) Total stem parasite  |  C) Semi stem parasite  |  D) Independent
8. Phalaris minor is a major mimicry weed of which crop?
   A) Barley  |  B) Wheat  |  C) Mustard  |  D) Gram
9. The 'physical method' of weed control includes:
   A) Hand pulling  |  B) Applying chemicals  |  C) Crop rotation  |  D) Releasing insects
10. What type of herbicide is 2,4-D?
    A) Non-selective  |  B) Selective  |  C) Soil fumigant  |  D) None
11. Which is a Kharif season weed?
    A) Bathua  |  B) Trianthema (Santi)  |  C) Kasni  |  D) Krishnanil
12. Compared to crops, the viability of weed seeds is:
    A) Lower  |  B) Higher (survive for long)  |  C) Equal  |  D) Zero
13. Seeds of which weed mix with Berseem seeds and are hard to separate?
    A) Wheat  |  B) Chicory (Kasni)  |  C) Mustard  |  D) Lucerne
14. Scientific name of 'Satyanaashi' (Prickly poppy) is:
    A) Argemone mexicana  |  B) Convolvulus  |  C) Cyperus  |  D) None
15. Most suitable nozzle for herbicide application is:
    A) Hollow cone  |  B) Flat fan or Flood jet  |  C) No nozzle required  |  D) Any
16. Example of Perennial weeds is:
    A) Bathua  |  B) Cynodon dactylon (Doob grass)  |  C) Wild oat  |  D) Pyaji
17. Absolute weeds are those which:
    A) Always harmful  |  B) Sometimes beneficial  |  C) Only grow in fields  |  D) Are white
18. Selective herbicide means one that:
    A) Kills all plants  |  B) Kills only specific plants (weeds) without harming the crop  |  C) Cleans soil  |  D) None
19. Convolvulus arvensis (Hirankhuri) is what type of weed?
    A) Annual  |  B) Perennial  |  C) Biennial  |  D) None
20. Applying herbicide before sowing is called:
    A) PPI (Pre-plant incorporation)  |  B) Pre-emergence  |  C) Post-emergence  |  D) None
21. Example of a Non-selective herbicide is:
    A) 2,4-D  |  B) Paraquat or Glyphosate  |  C) Atrazine  |  D) Simazine
22. Which insect is released for biological control of Parthenium?
    A) Motha  |  B) Zygogramma bicolorata  |  C) Doob grass  |  D) Bathua
23. 2,4-D is primarily used to kill which type of weeds?
    A) Narrow leaf  |  B) Broad leaf weeds  |  C) Grasses  |  D) Thorny
24. Post-emergence herbicide used is:
    A) Fluchloralin  |  B) Isoproturon  |  C) Atrazine  |  D) None
25. Nutrient loss from soil by weeds compared to crops is:
    A) Lower  |  B) Very high (approx 2-3 times)  |  C) Equal  |  D) Zero
26. To which Family does Chicory (Kasni) belong?
    A) Leguminosae  |  B) Asteraceae (Compositae)  |  C) Gramineae  |  D) Solanaceae
27. Weeds growing in irrigation channels are called:
    A) Aquatic weeds  |  B) Desert  |  C) Field weeds  |  D) None
28. Why is Wild Oat (Avena fatua) hard to identify in wheat?
    A) Taste  |  B) Mimicry (morphological similarity)  |  C) Height  |  D) Color
29. The 'Cultural methods' of weed control include:
    A) Crop rotation  |  B) Changing sowing time  |  C) Mixed cropping  |  D) All of the above
30. Atrazine is primarily used in which crops?
    A) Wheat  |  B) Maize, Sorghum and Pearl Millet  |  C) Mustard  |  D) Pea
31. Mixture of weed seeds in Pure Line seeds is called:
    A) Waste  |  B) Objectionable weeds  |  C) Mimicry  |  D) None
32. Hirankhuri spreads primarily through:
    A) Seed only  |  B) Seed and Underground roots  |  C) Air  |  D) Water
33. Excessive use of 2,4-D can harm which crop the most?
    A) Maize  |  B) Cotton (very sensitive)  |  C) Sorghum  |  D) Pearl millet
34. Used as a Soil Fumigant:
    A) 2,4-D  |  B) Methyl Bromide  |  C) Isoproturon  |  D) Mancozeb
35. Biological control of Water Hyacinth (Eichhornia) is done by:
    A) Goat  |  B) Neochetina eichhorniae beetle  |  C) Fish  |  D) None
36. Which disease can humans get from Parthenium?
    A) Fever  |  B) Dermatitis and Allergy  |  C) Jaundice  |  D) Malaria
37. Weed seed production capacity (e.g. Makoy) per plant can be:
    A) 100  |  B) Up to 1,75,000  |  C) 1000  |  D) 500
38. Which herbicide is called 'Total Herbicide'?
    A) 2,4-D  |  B) Glyphosate  |  C) Atrazine  |  D) Simazine
39. What is the benefit of Weed Seed Dormancy?
    A) Early germination  |  B) Survival for many years under adverse conditions  |  C) Death  |  D) None
40. The 'Legal method' of weed control includes:
    A) Weed seed limit under Seed Act  |  B) Field sanitation  |  C) Burning  |  D) None
41. Which weed seeds cause 'Dropsy' disease?
    A) Bathua  |  B) Argemone (Mustard oil adulteration)  |  C) Motha  |  D) Hirankhuri
42. What is the general Active Ingredient of Simazine?
    A) 10%  |  B) 50-80% WP  |  C) 100%  |  D) 5%
43. Example of a Soil Active herbicide:
    A) Paraquat  |  B) Simazine and Atrazine  |  C) 2,4-D  |  D) None
44. Dispersal medium for weed seeds:
    A) Air and Water  |  B) Animals and Humans  |  C) Machinery  |  D) All of the above
45. To which Family does Motha (Cyperus rotundus) belong?
    A) Gramineae  |  B) Cyperaceae  |  C) Solanaceae  |  D) None