You can get it as Batman quite easily, too. Just stand on the rooftop east of the entrance to Ivy's lair and look down. You might have to zoom in to get it. --- To be fair, it is far easier to replace a few dead interns than full Doctorates. They are the Red Shirts of Arkham. - OutlawDino http://wuyausu.com
This one had me stumped for a while, since I kept trying to scan the various roots visible around Ivy's hideout. (I believe it's north of the GCPD building.) You actually have to locate the aforementioned bio container floating in the water.
I found this the first time by marking the riddle on my map and the marker pointed right to the container. --- Number of people who like Poets of the Fall: 6 Waiting for: Bioshock: Infinite, Journey, Bully 2 (if the rumors are true)