Many drawbacks arise as a consequence of charging high fees for admission into public museums. These public institutions play a vital role in the local educational system, and charging high fees for entrance would exclude a large portion of the population, especially students and and the poor from visiting. For example, a survey carried out by several universities in developing nations has shown that most students are reluctant to pay for public services used during field trips and that they seek out places that are free of charge.

The text is mostly correct grammatically, there are only some things that I would fix: >This is because (no need for a comma here) high fees exclude a large proportion of the population, especially students and poor people. >For instance, a (replace "the" here, since you are trying to refer to a non-specific thing) survey carried out by many universities in developing nations has shown that students are reluctant to pay for the public places in their field trips (replace "visits" here, since the common term would be "field trips") and they often look for the museums that are (replaced the "in" here, since it didn't make sense with what you were trying to convey) free of charge.