Yes. iOS manages RAM using a process called "jetsam". When a process needs memory, jetsam will ask processes to compress or release memory. Failing that, it will kill a process. If a process hogs a lot of memory, you may see several jetsam logs in a few seconds, as it struggles to free up memory. I use music instrument apps that need a lot of memory, so I prefer to force-quit known memory hogs, especially browsers, regularly. (The high page sizes I've seen for BeWeather3 were logged by jetsam when it was the largest process.)
And by the way, the 257 apps on your Home screen use zero RAM. The processes visible in the Task Switcher are the ones currently using memory, along with some widgets and other items that are harder to see.
This article,
https://medium.com/flawless-app-sto...rint-and-oom-terminations-in-ios-a0f6bef38217 gives a good review of iOS memory management.