The assessment points are generic, so if you want to teach a science based lesson using a story to drive home the concept, then choose a book that reflects this. E.g. if you look at Eric Carle's The Hungry Caterpillar then you could do a lesson that looks at healthy eating, maybe question what the students have eaten for breakfast, ask for their contributions and then write a new story based on this. 30 mins is not long. Show at your interview that you are well prepared with resources that will give you the confidence to structure the lesson. Happy new year!