All disciplines appreciate writing that is well developed, organized, carefully worded and grammatically correct.
Each discipline has its own set of rules and conventions, (ways of structuring an essay, grammar preferences-past/present tense, first/third person, quotations/citation, etc.)
Your writing should reflect your ability to engage the language of a discipline and its content.
It is important to know your instructors expectations about the writing you are expected to produce for their class. The best way to know is ask.
The following list offers links to assist you in writing for different disciplines.