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The herbicide DCMU kills the weeds becau...

The herbicide DCMU kills the weeds because it inhibits

A

respiration

B

`CO_(2)` fixation

C

cell division

D

`NO_(3)^(2-)` uptake

Text Solution

Verified by Experts

The correct Answer is:
B
DCMU (Dichlorophenyl urea) is a herbicide which kills the weeds by inhibiting `CO_(2)` fixation as it is a strong inhibitor of photosystem II `(P_(680))` DCMU acts by blocking electron flow at the guanine acceptors of PS II, by competing for the binding site of plastoquinone.
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NCERT FINGERTIPS-PHOTOSYNTHESIS IN HIGHER PLANTS-Photosynthesis In Higher Plants
  1. Breaddonw of proton gradient developed during chemiosmosis leads to th...

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  2. During chemiosomotic synthesis of ATP, protons diffuse through CF(0) c...

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  3. The herbicide DCMU kills the weeds because it inhibits

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  4. Which of the following statements about dark reactions is correct?

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  5. Following table summarises the differences between light reactions and...

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  6. If green plant cells are incubated with O^(18)labelled CO(2). Which of...

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  7. Refer to the given diagrammatic representation of an electron microgra...

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  8. Refer to the given diagrammatic representation of an electron microgra...

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  9. In the given representation of Calvin cycle, identify A, B and C and s...

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  10. Read the given statements and select the correct option. Statement 1...

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  11. Identify the correct sequence of stages of Calvin cycle.

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  12. CO(2) combines with RuBP in the presence of enzyme RuBisco to from 3PG...

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  13. RuBisCO is

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  14. Glucose synthesis occurs during which stage of C(3) cycle?

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  15. During fixation of one molecule of CO(2) by C(3) plants, number of ATP...

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  16. How many ATP and NADPH molecuels are respectively required to mae one ...

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  17. How many number of CO(2) molecules are required to synthesise one mole...

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  18. Which of the following statements is incorrect regarding the Calvin cy...

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  19. Kranz anatomy is not exhibited by which of the following plants?

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  20. Select the incorrect statement as far as kranz anatomy is concerned.

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