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This video walks through the major internal cell types, including the waxy cuticle, upper epidermis, palisade mesophyll... Leaves come in many shapes and sizes.
- 6 min
- 178.5K
- BOGObiology
Key points. The leaf is one of the most important organs of a plant. Leaves produce food for the plant through a process called photosynthesis. The leaves of different plants vary widely in...
This video lesson is designed for 3-6-year-old children. It demonstrates the basic structure of a leaf and its parts. This science lesson provides a practical life experience by introducing the child to the different shapes and colors of leaves.
- The external parts of the leaf are the petiole, leaf base, lamina, leaf apex, and leaf margins.
- The internal parts of the leaf are stomata, guard cells, epidermal cells, mesophyll cells, and vascular bundles (xylem, phloem, veins)
- Stomata are tiny pores present on the surface of the leaves that help in exchanging gases, i.e. absorption of carbon dioxide and release of oxygen.
- Cuticle
- Upper Epidermis
- Palisade Mesophyll Layer
- Spongy Mesophyll Layer
- Lower Epidermis
It is the waxy layer of the leaf secreted by the epidermis, a thin layer of leaf present just below the cuticle. It performs the following functions: 1. Preventing excessive water loss from the leaves through transpiration 2. Controlling the exchange of gases such as dioxide and oxygen from the leaf surface Giving mechanical support and thus preven...
It is a thin layer of cells below the cuticle. Mostly they are devoid of chloroplasts and thus do not perform photosynthesis. The upper epidermis performs the following functions: 1. Preventing excessive water loss from the leaves through transpiration 2. Allowing sunlight to pass through the spaces between the cells and thus helping to initiate ph...
It is found just below the upper epidermis and is thus also called the upper leaf cells. They consist of columnar cells arranged vertically beside each other, much like the columns of a building. The columnar cells are tightly packed to maximize the absorption of sunlight. Sometimes it can consist of several layers of cells, particularly in environ...
This layer is found below the palisade layer. Also called the lower leaf cells, the spongy layer consists of irregularly shaped cells consisting of the vascular tissues – xylemand phloem, forming the vascular bundles. The vascular tissues are surrounded by parenchymal pith and collenchymas. The cells contain minute pores called stomata (Singular: s...
It is located on the bottom side of the leaves below the spongy mesophyll layer of cells. Stomata are essential structures in the lower epidermis. There may be up to one million stomata per square centimeter. Each stoma is flanked by kidney-shaped epidermal cells called guard cells. The guard cells control the opening and closing of stoma based on ...
Key learning points. Plant cells have some common structures. Some of these structures are common with animal cells, such as the cytoplasm, cell membrane, nucleus and mitochondria. Plant cells have additional structures including the cell wall and vacuole, and some have chloroplasts.
So, a cell wall is made of fibres to strengthen the cell, and then a cell membrane controls which substances enter and leave the cell. A chloroplast is where the light is trapped to help make the plant's food.
People also ask
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Mar 22, 2022 · Learn about the structure and function of the cells in leaves. Leaves are essential to life on earth. They can be tiny, like the leaves of the common water fern (Azolla filiculoides), which are just one millimetre in length. And they can be large, like the leaves of the raffia palm (Raphia regalis) that can grow to be 25 metres in length.
