Question

Which of the following groups of herbicides is derived from urea, and is used for controlling weeds in tea, tobacco and cotton?

• A. Carbamates
• B. Triazines
• C. Pyrethroids
• D. Organophosphate

Answer 1

Answer: (B)

Triazines

A carbamate is an organic compound which is derived from carbamic acid (NH${}_2$COOH).

A pyrethroid is an organic compound similar to the natural pyrethrins produced by the flowers of pyrethrums (Chrysanthemum cinerariaefolium and C. coccineum). Pyrethroids now constitute the majority of commercial household insecticides.

An organophosphate or phosphate ester is the general name for esters of phosphoric acid.

Triazines show antimalarial, antibacterial, and antimicrobial activities. They are derived from urea and used in tea, cotton and tobacco plantation and some orchid plantation. Thus, option B is correct.