The pair of woolen socks is covered with who knows how much pollen and spores.
In terms of reproduction, plants are truly "a tree a world." There's an old saying in China, if plants get wild, there's nothing mammals can do.
Faced with the traces left by plants, even Jiang Yuan can only selectively take a portion.
This is another checkpoint that tests botanological expertise. Those lacking in skills might not even know which spores to pick up when facing such battle-hardened woolen socks, easily leaving something exposed.
Without sufficient experience, students like Qiao Shengli can only pinch spores well under the slide, observing repeatedly to reference the appropriate books. Of course, the reality is, although there are plenty of spores, the overall varieties won't be many. A bit of basics can make it easy to handle one pair of woolen socks.
