* Made up of multiple tissues: A leaf is not just a single type of cell. It's comprised of several different tissues working together:
* Epidermis: The outer layer that protects the leaf and helps with water regulation.
* Mesophyll: The inner tissue containing chloroplasts where photosynthesis takes place.
* Vascular bundles: Xylem and phloem tissues that transport water and nutrients throughout the plant.
* Has a specific function: The primary function of a leaf is photosynthesis, the process of converting light energy into chemical energy (sugars). It also contributes to transpiration (water loss) and gas exchange (taking in CO2 and releasing O2).
* Part of a larger system: Leaves are integral components of the plant's body, working in conjunction with other organs like the stem and roots to maintain the plant's life.
Therefore, a leaf meets the definition of an organ: a group of tissues that work together to perform a specific function in the larger organism.
