This resource is provided by the Morrisons Lets Grow campaign. They provide lesson plans for KS2 learning, teaching children the importance of leaves for plants, the essential resources they require, and how leaves help plants make their food.
There is lots of useful information provided, such as objectives, relevance to the curriculum, equipment/resources lists. There are lots of activities included, but a key one is the experiment investigating light/dark influence on leaf colour, with evaluation sheets along side.