To solve this problem, we need to identify the correct statement regarding the human digestive system. Let's analyze each option:$\newline \bullet$Option 1: Serosa is the innermost layer of the alimentary canal.$\newline$ - This statement is incorrect. The serosa is actually the outermost layer of the alimentary canal. The innermost layer is the mucosa.$\newline \bullet$Option 2: Ileum is a highly coiled part.$\newline$ - This statement is correct. The ileum is the final and longest part of the small intestine and is highly coiled to increase surface area for absorption.$\newline \bullet$Option 3: Vermiform appendix arises from duodenum.$\newline$ - This statement is incorrect. The vermiform appendix arises from the cecum, which is part of the large intestine, not the duodenum.$\newline \bullet$Option 4: Ileum opens into the small intestine.$\newline$ - This statement is incorrect. The ileum is part of the small intestine and opens into the large intestine at the ileocecal junction.$\newline$Therefore, the correct statement is Option 2: Ileum is a highly coiled part.