Testing in a Biodome: Science Fiction

A drop of sap was the only warning he had. As second later, the vine dropped out of the sky and looped around his neck. If he hadn't thrown himself backward when the drop of sap struck his nose, it would have wrapped itself around his throat and strangled him. As it was, it only jarred his chin up high enough that he was studying the habitat roof from an uncomfortable angle. He leapt back, out of the noose, and scanned his surroundings. It took him a minute to ascertain that there were no new threats, and then he rubbed the crick out of his neck. Damn tests. It didn't matter that he did pretty well on them; every time, he came out of them feeling like he'd been terraformed into the ground. It didn't matter that he had a score in the top--

Inspiration: the plant on top of my desk
Story Potential: Medium.
Notes: Eh. Yeah, obviously some sort of training, for some sort of reason, for some sort of goal that I don't really care about....