The weed killer DCMU blocks the flow of electrons from the electron tr

1.	The weed killer DCMU blocks the flow of electrons from the electron transport chains in photophosphorylation. Why does this kill the plant? (a) Active transport of mineral ions is prevented (b) ATP and reduced NADP are not produced (c) Photoactivation of the chlorophyll cannot occur (d) Photolysis of water does not occur
Answer» Correct option is (b) ATP and reduced NADP are not produced Only the electron transport system produces ATP and reduced NADP in the plant. Without these compounds, the Calvin cycle cannot proceed and carbon-fixation cannot occur and their is no respiratory substrate available for respiration.

The weed killer DCMU blocks the flow of electrons from the electron transport chains in photophosphorylation. Why does this kill the plant? (a) Active transport of mineral ions is prevented (b) ATP and reduced NADP are not produced (c) Photoactivation of the chlorophyll cannot occur (d) Photolysis of water does not occur

Answer»

Correct option is (b) ATP and reduced NADP are not produced

Only the electron transport system produces ATP and reduced NADP in the plant. Without these compounds, the Calvin cycle cannot proceed and carbon-fixation cannot occur and their is no respiratory substrate available for respiration.

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