The Chloroplasts (parts of the plant cell where photosynthesis takes place) are now bundled together rather than being spread out, which increases production of glucose and oxygen.
They used net venation instead of parallel venation, which allows more space for water exchange. (Venation is a term referring to how the veins in a leaf are spread out)
Leaves generally have a large surface area, which allows more sunlight on the leaf to photosynthesise more.
Root hair cells have a larger surface area and are thinner, so more water can be absorbed for photosynthesis.
Plants can control the amount of photosynthesis they do to save their leaves. This id because they use up water when photosynthesising, and in hot places they need to keep the water, rather than use it.
In the winter, leaves lose their chlorophyll and moisture and drop of the pant. This prevents wasting energy during the winter when there is less sunlight and not as many leaves are needed.