Correct answer: (B) inhibits PS-II. DCMU (Dichlorophenyl Dimethyl Urea) is a herbicide, which inhibits O_2 evolution and non-cyclic photophosphorylation, O_2 evolution and non-cyclic photophosphorylation both involve in PS-II.

Q59 / 200 · JIPMER 2008 · Botany

DCMU

A
inhibits PS-I
Correct answer
B
inhibits PS-II
C
destroy chloroplast
D
inhibits oxidative phosphorylation

Solution

DCMU (Dichlorophenyl Dimethyl Urea) is a herbicide, which inhibits $\mathrm{O}_2$ evolution and non-cyclic photophosphorylation, $\mathrm{O}_2$ evolution and non-cyclic photophosphorylation both involve in PS-II.

Hence, the correct answer is option: 'B'.

DCMU

Solution

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