The word "on" fits better meaning "on the subject of question 1". The word "in" fits better meaning "occurring in question 1", or in its answer, if that is what is meant. The comments would be understood with either "on" or "in", though. Since you've invited rewording, these might work: For question 1, you repeated the example as a sentence.
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The answer to this question is "Horse." This answer is based on a play on words, as "neigh" is the sound a horse makes, and it is a pun on the word "nay," which means no.
How do you answer the question How long have you known the applicant and in what capacity? "For several years personally and professionally" is a good answer to this question.
How do you answer the question 'How long have you known the applicant ...
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