many of us know that we can get electricity from lemons .BUT DOES ANY ONE CAN TELL ME WEATHER WE CAN GET ELECTRICITY FROM THE GREEN PLANTS BRANCHES OR NOT ? IF YES HOW MUCH

Get electricity in what sense ?
You can always get some electricity due the presence of electrolytic motion within the plants.

himanshu ... the answer is yes.

There are numerous examples of this being done using bacteria that could be adopted to work with green plants.