Biology · Plant Physiology and Herbicides
Why do phenoxy herbicides selectively target and kill broad-leaf weeds (dicots) while leaving monocots largely unaffected?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1They mimic the natural plant hormone indole-3-acetic acid (IAA), inducing uncontrolled growth and vascular collapse in dicots✓
- 2They selectively chelate vital soil micronutrients required by broad-leaf plants
- 3They block active nitrogen uptake across root membranes
- 4They act as specific inhibitors of electron transport in photosystem II
Correct answer
They mimic the natural plant hormone indole-3-acetic acid (IAA), inducing uncontrolled growth and vascular collapse in dicots
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