Almost everything from IKEA is particle board or MDF. If it's solid wood it will be priced higher - even pine. I have a couple of particle board items from them and they are definitely heavier compared to actual wood.
The cheapest nightstand they sell is solid pine.
https://www.ikea.com/us/en/p/rast-3-drawer-chest-pine-104847...
The cheapest full bed is solid pine, too.
https://www.ikea.com/us/en/p/neiden-bed-frame-pine-80395248/
I could go on...