Killing the plant in resident evil nintendo ds?

Can anyone tell me how to do this, i have found the room with the large plant, and also the room with the root. I believe i have to kill the root first can anyone tell me how to do this, do i need chemicals and if so does anyone know where i can find these, im playing with Jane on the easy level as i am new to this

Answers:
In a room located in the 1F west wing mansion, there lives a weird plant. This
plant consist of several plant-like tentacles, which is apparently guarding the
Armor Key behind it. Anyone attempt to get past it will be whipped. These
tentacles cannot be hitted by any weapon at all, and the only way to destroy it
is to use the CHEMICAL in the pump machine, which should pump the chemical into
the tentacles.
nintendos are for nerds

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