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Water is absorbed from the soil by root hair cells. Provides a short distance for carbon dioxide to move by diffusion into the leaf.
Contains chlorophyll. Absorbs light. Allows carbon dioxide to move by diffusion into the leaf. Guard cells. To open and close the stomata depending on the conditions. Structure and Function of a Chloroplast. Electron micrographs of a chloroplast may differ in appearance depending on where the cross-section occurs. Typically, chloroplast diagrams should display the following features:. Chloroplast Diagrams. Brent Cornell. Cell Introduction 2.
Cell Structure 3. Membrane Structure 4. Membrane Transport 5. Origin of Cells 6. Cell Division 2: Molecular Biology 1.
Metabolic Molecules 2. Water 3. Cells in the leaf are loosely packed. Light absorption happens in the palisade mesophyll tissue of the leaf.
Palisade cells are column shaped and packed with many chloroplasts. They are arranged closely together so that a lot of light energy can be absorbed. Adaptations of the leaf for photosynthesis and gaseous exchange Leaves are adapted for photosynthesis and gaseous exchange. Functions of leaves The function of a leaf is photosynthesis - to absorb light and carbon dioxide to produce glucose food. Features of leaves Adaption Purpose Large surface area To absorb more light Thin Short distance for carbon dioxide to diffuse into leaf cells Chlorophyll Absorbs sunlight to transfer energy into chemicals Network of veins To support the leaf and transport water, mineral ions and sucrose sugar Stomata Allow carbon dioxide to diffuse into the leaf and oxygen to diffuse out Structure of a leaf The internal structure of the leaf is also adapted to promote efficient photosynthesis.
Functions of tissues of the leaf Adaption Purpose Epidermis is thin and transparent To allow more light to reach the palisade cells Thin cuticle made of wax To protect the leaf from infection and prevent water loss without blocking out light Palisade cell layer at top of leaf To absorb more light and increase the rate of photosynthesis Spongy layer Air spaces allow gases to diffuse through the leaf Palisade cells contain many chloroplasts To absorb all the available light Gas exchange When a plant is carrying out photosynthesis carbon dioxide needs to move from the air into the leaf.
Absorbing light energy Light absorption happens in the palisade mesophyll tissue of the leaf. Large surface area. To absorb more light. Short distance for carbon dioxide to diffuse into leaf cells.
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