General

Photosynthesis means light-making, for "photo" means light, and "synthesis" means making, the same way one could synthesise music. And so, what is the light making? Sugars, right? And what do plants give out? What helps us to breathe? Oxygen, right? So we already get it that plants need light, that they make sugar and oxygen.

And so, what is it that plants are making the sugar and oxygen from? Well, they need water, right? And they take carbon dioxide out of the air -that's how they help to fight global warming. So we also get it that they are using water and carbon-dioxide.

So, you already know it, you just need to let yourself realise that you get it. They plants are making sugars and oxygen from water and carbon-dioxide and using light energy. And all that happens in those little green blobs called chloroplasts - the blobs that make plants green!

General

Give the seed water and a chance to take root, a chance to breathe in the air, taking the carbon-dioxide it needs, building sugars, exhaling the oxygen it makes, and it will grow in time to become the most wonderful of plants.