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STD 11 - 13. Plant growth and development — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 13. Plant growth and development1 Mark
MCQ
Which plant growth regulator is responsible for triple response?
  • ✓
    $C _{2} H _{4}$
  • B
    $IAA$
  • C
    $IBA$
  • D
    $ABA$
✓

Answer

Correct option: A.
$C _{2} H _{4}$
a
Firstly, a Russian Physiologist Dimitry N Nelijubow who established ethylene's triple response on pea seedling. These triple responses are

$(a)$ inhibited stem elongation

$(b)$ increased stem thickening

$(c)$ horizontal growth habit

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