If you want to save 25 answers for each model you need 25 columns in your answers table, where each row represents a record for the the 25 answers.
Your table should have columns id, name (or any other info), answer1, answer2, answer3, and so on.
When you receive the answers you should save it using
$answerModel->answer1 = $_POST['QuestionForm']['question1'];
$answerModel->answer2 = $_POST['QuestionForm']['question2'];
$answerModel->answer3 = $_POST['QuestionForm']['question3'];
... so on ...