Hey!

You haven't mentioned the name of the book. Different boards have prescribed different books as references for students. Also, in 8th standard, the books might be prescribed by the school which may not match with the other schools of the same board. So, write the book name along with their author and the name of the chapter. You may write these details in the comment section or you may repost your question with these details on the portal so that it can be answered accordingly.