To be most effective, herbicides must be deactivated before they reach their site of action in a plant.

To be most effective, herbicides must be deactivated before they reach their site of action in a plant.

• A. True
• B. False
• C. Not applicable
• D. Depends

Answer: (B)

Herbicides work by interfering with a specific process inside the plant at a defined site of action. To be effective, they must reach that site in an active form. If the chemical is deactivated before it reaches the site, it can no longer interact with the target and will not control the weed. Some compounds are designed as proherbicides and are activated by plant metabolism after uptake, but the activation occurs inside the plant; deactivating the compound before it reaches the site would prevent this activation and abolish the effect. So the statement is not correct.

Herbicides work by interfering with a specific process inside the plant at a defined site of action. To be effective, they must reach that site in an active form. If the chemical is deactivated before it reaches the site, it can no longer interact with the target and will not control the weed. Some compounds are designed as proherbicides and are activated by plant metabolism after uptake, but the activation occurs inside the plant; deactivating the compound before it reaches the site would prevent this activation and abolish the effect. So the statement is not correct.