If I were to study biology or chemistry in university (such as UBC or UCLA) would I need to take physics in high school? And would I still have to take some physics in university even though I’m doing bio or chem?
It is not necessary to take Physics in HS, but to be a competitive applicant to UCLA and UCB, it will definitely help.
As for taking physics in college, pretty much all STEM major will take at least 1 Physics course so having prior exposure in HS will help.
Regardless of the schools, Gumbymom’s post still applies. Most biology and chemistry majors are required to take physics (I don’t know of any program that doesn’t require physics, but I’m sure there are some out there if you want to find them). You can check the school’s website to look for what specific courses are required for each major to confirm that the majors do or do not require physics. Most department’s list these requirements online. Having exposure to physics in high school will likely make it easier for you to do well in physics in college.
I don’t believe physics is required for admission (at least to UCLA, I’m not familiar with UBC’s requirements), but not taking any physics in high school may make you less competitive when you’re compared to applicants who have taken the three main science courses (biology, chemistry, and physics). That may not matter to much in light of the rest of your application, but if you want to be as competitive as possible and/or be better prepared for physics in college, it may be beneficial to consider taking physics in high school.