Have a taste test. Brainstorm a list of words describing apples and record on the board. Make apple 'describing word' mobiles. Cut up an apple and find the apple seeds. Count how many seeds there are.
Pupils plant the seeds and see if they can grow an apple tree.
Have the class locate and adopt an apple tree. Paint or draw pictures of the tree. Visit the same tree in different seasons and draw seasonal pictures showing the changes to the tree. Find out how pupils think the apple that they have for lunch or at home actually arrives. Start with the tree.