A deciduous leaf's structure is divided into two categories, internal and external, with external structures including the blade, the petiole and the stipules and internal structures including the epidermis, the palisade layer, the spongy mesophyll, the vascular bundle, the stomata and the guard cells. Leaf composition differs from tree to tree but adheres generally to these overarching categories.Know More
Leaves absorb light to facilitate photosynthesis, the process by which trees turn light into energy for growth. They also exchange moisture and gas with the atmosphere to keep trees healthy.
A leaf's internal features perform the following functions:
Internal structures have to do primarily with the functions of the leaf and its part as a component of the tree's larger system.
A leaf's external features are organized in the following ways:
Leaves are vital to the health of deciduous trees and are an important part of forest ecology. Decomposing, they reintroduce nutrients to the forest's soil and allow for the growth of their parent trees and of new vegetation and growth.Learn more about Botany
The lower epidermis contains stomata cells that help prevent water loss and regulate the exchange of gases such as oxygen and carbon dioxide, enabling plants to survive. Other cells in the lower epidermis include a waxy cuticle to protect underlying layers, according to Education Portal. Transparency in epidermal cells allows sunlight to pass through to chloroplasts, which are involved in photosynthesis.Full Answer >
Carbon dioxide enters the leaf through tiny openings called the stomata. These specialized apertures open during the day to allow for the exchange of carbon dioxide and water in a process known as transpiration.Full Answer >
Stomatal density refers to the number of stomata present on plant leaves per square millimeter. Leaf stomata are small pores that facilitate gas exchange in plants. These pores allow carbon dioxide to be absorbed and water to be released.Full Answer >
The two gases that move in and out of the stomata on plant leaves are carbon dioxide and oxygen. The exchange of these two gases plays a vital role in photosynthesis, which is the process by which plants use light to produce and store the energy they require for their metabolic needs. In addition to light, carbon dioxide and water are required for this process to occur, and oxygen is a byproduct.Full Answer >