The structure of a leaf

1. Blades

The leaf blade consists of three parts: epidermis, mesophyll and veins. Leaves are important organs for plants to produce nutrients and are an important place for photosynthesis and respiration. The essence of photosynthesis is the process by which green plants use light energy through chloroplasts to synthesize organic matter from carbon dioxide and water and release oxygen. Respiration is the process by which plants absorb oxygen, decompose organic matter into carbon dioxide and water, and release the energy needed for plant growth.

2. Petiole

The petiole is the part that connects the leaf blade and the stem. Its upper end is connected to the leaf blade, and its lower end is connected to the stem. The petiole is very small, but its function is very powerful. The main functions of the petiole are conduction and support. There are vascular bundles inside the petiole, which are the main channels for transporting water and nutrients between the stems and leaves. Moon cakes are generally cylindrical or slightly flat in shape.

3. Stipules

Stipules are attached to the junction of the petiole and the stem, located on both sides. Their shape and function vary depending on the plant. For example, the stipules of peas can carry out photosynthesis, while the stipules of sour jujube can become thorns. The stipules of more plants will fall off during the growth process.