Green on matters?

[yasmine]

Test No. incompl/inter-2 "Like a red rag", question 3

She hasn't worked here very long and is therefore a little ......... on matters of procedure.

(a) red
(b) blue
(c) white
(d) green

Test No. incompl/inter-2 "Like a red rag", answer 3

She hasn't worked here very long and is therefore a little green on matters of procedure.

Correct answer: (d) green

what does " to be green on something means"

I think it means that its: not to know well the thing in question .

I just would like you to confirm, if Im right .and , bye the way, give me the origin of the expression.

and, sorry for my english

thanks, yasmine

[Alan]

Yes - it means inexperienced, you're right. It comes from the idea of plants when they first start to grow appearing as green shoots in the ground.
Alan
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[sipa2008]

Hi: Can anyone tell me if large city, metropolis and urba area are synonym?