How about introducing some really descriptive language to the children about taste and touch. With the prickly outside and pointed leaves you could bring in some fun words here.
Perhaps ask the children where they think pineapples grow and how that climate is different to our own. How do they think pineapples are picked (harvested)? In some countries people shin up the trees to gather them - that should take their interest!
All the best with your assessment
Ooops sorry its coconuts where they shin up trees but there are some good pictures of pineapple harvests online.