a scientific experiment can be conducted only in a laboratory true or false?

False...

False, although some can only feasibly be done 'in the lab', a number can be done 'in the field'. for example the reactions the LHC was built to look at occur naturally in the upper atmosphere, the problem is that you can't really put precision detectors up that high so a device was build to reproduce those collisions on the ground.

False. You could do an experiment anywhere, just as long as you are careful and review the saftey rules and follow the directions and have the right equiment. Basically, as long as you have what you need and are careful and follow directions, you don't have to have a special "lab room" or whatever.

It depends on the experiment. Some experiments need special equipment that needs a lab but you can do experiments without a lab.

False, they do it in jungles for petes sake watch Nova or National Geo

Only if you don't define the entire world as your laboratory.