Quick question about plant biology!?

Question

How would external stimuli be perceived most quickly on a plant? We're given five choices for the location of the signal transduction and we're told to choose which it would be perceived most quickly in.

1. cell membrane

2. cytoplasmic matrix

3. endoplasmic reticulum

4.nuclear membrane

5. nucleoplasm

My guess is 1 because it is on the outside and would be hit first. Is that correct?

Answer 1

^_^ yes