I just downloaded a 3d plant asset in FBX format from Megascans and this is the way my model appears.
The wheat seems to not be flat, and non-transparent. How do I make it transparent around the grains, and not as rectangular?
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To have "transparency" you need some form of mask or map for it.
Let's say you have two images:
1- The color information
2 - A "Transparency" or "Opaque" map, which would be a black and white image that determines what is "see through" (black) and what is opaque (white).
Usually this information is embedded in an "Alpha" channel, but since you are dealing with the worst possible format (jpeg) there is no alpha channel.
To use the transparency, use an image texture node and plug it to the alpha socket of the Principled BSDF.