The Variety of Life 10.4 Plant Cell Structure. Plant Cell Structure Learning Objectives There are fundamental differences between plant cells and animal.

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Presentation transcript:

The Variety of Life 10.4 Plant Cell Structure

Plant Cell Structure Learning Objectives There are fundamental differences between plant cells and animal cells. The structure of a palisade cell from a leaf as seen with an optical microscope. The appearance, ultrastructure and function of cell wall chloroplasts. Candidates should be able to apply their knowledge of these and other eukaryotic features in explaining adaptations of other plant cells.

Starter Draw a plant cell and label it

Plant Cell Complete plant cell worksheet Make sure you know what the key parts do

Palisade Cells – Adapted to the function of photosynthesis Continuous layer to absorb sunlight Many chloroplasts around edges to collect maximum light Large vacuole to push chloroplasts to edges

Chloroplasts Chloroplast envelope – double plasma membrane. Controls what is allowed in and out. Grana – stacked thylakoids, which contain chlorophyll. Stroma – full of fluid and contains starch grains.

Chloroplasts Label and annotate the diagram of the chloroplast

Chloroplasts thylakoid contains chlorophyll granum chloroplast envelope stroma

Adaptations of chloroplasts Granal membranes = large surface area for chlorophyll, electron carriers and enzymes essential for the first stage of photosynthesis Stroma (fluid) contains enzymes needed for the second stage of photosynthesis Contain DNA and ribosomes to enable quick and easy manufacturing of proteins needed for photosynthesis

Cell Walls – Complete the table StructureFunctions Made of polysaccharides (cellulose). A thin layer (middle lamella) forms the boundary between cell walls. The cellulose molecules are found in microfibrils. Provides strength to prevent cells bursting. Gives mechanical strength to the whole plant. Sticks adjacent cells together. Allows water to pass along it, so water can keep moving through the whole plant.

Plenary Differences between plant and animal cells Plant CellsAnimal Cells Have cellulose cell walls as well as a cell membrane around the cell Cell membrane around the cell Large numbers of chloroplastsNo chloroplasts Usually have a large vacuoleRarely have a vacuole, and if they do they are small Starch grains used for storageGlycogen granules used for storage

Application Work through questions 1 – 11 on pages 160 – 161 of the AS textbook.