no you do not capitalize the names of trees
yes you do because Elm, Oak, Maples , Ashes, Willows , Walnuts, etc.
Yes, in writing, you should capitalize the names of books.
No.
Yes you do.
yes because you capitalize all names
Yes.
Yes.
Capitalize them
no you don't have to
Yes.Example: Titanic
i dont but most folks do capitalize the first letters at least of all the bigger words & even many of the smaller words in the names of plays
No it shouldn't be capitalized.
If you are writing in APA style (and I assume you are), you do not capitalize the names of theories or hypotheses.