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The plant hormone used to destroy weeds in a field
  • a)
    2, 4-D
  • b)
    IAA
  • c)
    NAA
  • d)
    IBA
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The plant hormone used to destroy weeds in a fielda)2, 4-Db)IAAc)NAAd)...
Synthetic auxins are used as weedicides.
Option 1:
  • IBA (indole butyric acid ) is natural auxin.
  • It plays a major role in inducing adventitious roots in stem cuttings. 
  • Therefore, this is the incorrect option.
Option 2:
  • IAA (Indole acetic acid) is also natural auxin.
  • It plays a major role in the elongation of plants and their development. 
  • Therefore, this is the incorrect option.
Option 3:
  • NAA (Naphthalene acetic acid) is a synthetic auxin.
  • It initiates the rooting process.
  • It is also useful in plant tissue culture. 
  • Therefore, this is the incorrect option.
Option 4:
  • 2, 4-D (2, 4-dichlorophenoxyacetic) is synthetic auxin. 
  • 2,4-D is widely used to remove broad-leaved weeds or dicotyledonous weeds in cereal crops or monocotyledonous plants.
  • It is also used to prepare weed-free lawns by gardeners. 
Therefore, the correct answer is option 4.
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