The part of a plant that is above ground and specialized for photosynthesis is the leaves.

Here's why:

* Leaves are the primary photosynthetic organs: They contain chloroplasts, which are the organelles responsible for capturing sunlight and converting it into energy through photosynthesis.

* Large surface area: Leaves have a broad, flat shape that maximizes their exposure to sunlight.

* Stomata: Leaves have tiny pores called stomata on their surface, which allow for gas exchange (taking in carbon dioxide and releasing oxygen) necessary for photosynthesis.

While other parts of the plant may also contribute to photosynthesis to some extent, leaves are the most specialized and efficient organs for this process.