Question:
The mode of herbicide action wherein the weed plants are bleached white, is caused by which of the following herbicides?
The mode of herbicide action wherein the weed plants are bleached white, is caused by which of the following herbicides?
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Bleaching herbicides:
- HPPD inhibitors: Tembotrione, Mesotrione.
- Carotenoid biosynthesis inhibitors.
- Cause white (bleached) appearance in weeds.
- HPPD inhibitors: Tembotrione, Mesotrione.
- Carotenoid biosynthesis inhibitors.
- Cause white (bleached) appearance in weeds.
Updated On: Aug 27, 2026
- Atrazine
- Clodinafop propargyl
- Pendimethalin
- Tembotrione
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of herbicide modes of action, specifically bleaching herbicides.
Step 2: Detailed Explanation:
Tembotrione is a bleaching herbicide that inhibits 4-hydroxyphenylpyruvate dioxygenase (HPPD).
It causes the plant to turn white (bleaching) due to the disruption of carotenoid synthesis.
Atrazine (A): PS-II inhibitor (does not cause bleaching).
Clodinafop propargyl (B): ACCase inhibitor (grass killer).
Pendimethalin (C): Microtubule assembly inhibitor (does not cause bleaching).
Thus, tembotrione causes bleaching.
Step 3: Final Answer:
Thus, the herbicide that causes bleaching is Tembotrione, which corresponds to option (D).
[0.5cm]
This question tests knowledge of herbicide modes of action, specifically bleaching herbicides.
Step 2: Detailed Explanation:
Tembotrione is a bleaching herbicide that inhibits 4-hydroxyphenylpyruvate dioxygenase (HPPD).
It causes the plant to turn white (bleaching) due to the disruption of carotenoid synthesis.
Atrazine (A): PS-II inhibitor (does not cause bleaching).
Clodinafop propargyl (B): ACCase inhibitor (grass killer).
Pendimethalin (C): Microtubule assembly inhibitor (does not cause bleaching).
Thus, tembotrione causes bleaching.
Step 3: Final Answer:
Thus, the herbicide that causes bleaching is Tembotrione, which corresponds to option (D).
[0.5cm]
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