Go for a walk in the yard or neighborhood. Take a plastic bag to collect different kinds of leaves and a digital camera. Ask questions: What do you notice about the trees? What do you notice about the leaves? Do all the trees have the same kind of leaves? Besides leaves, what other parts of a tree can you see?
Take the collection inside, and press the leaves on the sticky side of a piece of Contact paper.
Leaves are very important parts of plants, including trees. Leaves make food for the plants, so the plants can live. The plants need sunlight, water, and nutrients.
Do all the leaves look the same? How are the leaves different? Are there any features that all the leaves have in common? How many 'points' do the leaves have?
Some have needles, some are broadleaf, some are long and thin, some are wide, some have one part, and others have lots of little parts.
Compare lengths of the leaves against other things e.g. this one is longer than my shoe; this one is smaller/shorter than my hand etc.