Explain that fruits and vegetables are really swollen ovaries of a blossom that grew on the plant. Show students an apple and point out the leftover blossom and stem on opposite ends. Cut the apple open to expose the seeds formed inside the ovary. Let the students examine the seeds. Save the students' flower parts to be used in the next lesson and in the plant journal.
Extension Take students on a walk to search for fruit-bearing plants that show blossoms and fruit.
Try to find examples of the transition from blossom to fruit on a plant. Cut open a blossom to expose the swollen ovary inside, the beginning of the fruit. Have students examine a dandelion flower and one which has gone to seed. This is a great example of a composite flower. Each seed is formed in its own flower but combined with others.