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The plant cells Plant cells are eukaryotic cells that different in several key aspects from the cells  of other eukaryotic organisms. Their distinctive.

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Presentation on theme: "The plant cells Plant cells are eukaryotic cells that different in several key aspects from the cells  of other eukaryotic organisms. Their distinctive."— Presentation transcript:

1 The plant cells Plant cells are eukaryotic cells that different in several key aspects from the cells  of other eukaryotic organisms. Their distinctive features include: A large central vacuole , a water-filled volume enclosed by a membrane known as the tonoplast  that maintains the cell's turgo controls movement of molecules  between the cytosol  and sap , stores useful material and digests wasteproteins and arganelles

2 A cell wall composed of cellulose and hemicellulose, pectin and in many cases lignin is secreted by the protoplast  on the outside of the cell membrane This contrasts with the cell walls of fungi which are made of chitin , and of bacteria which are made of peptidoglycan . Cell walls perform many essential functions: they provide shape to form the tissue and organs of the plant, and play an important role in intercellular communication and plant-microbe interactions.

3 Specialized cell-to-cell communication pathways known as plasmodesmata pores in the primary cell wall through which the plasmalemma and endoplasmic reticulum of adjacent cells are continuous. Plastids , the most notable being the chloroplast which contains chlorophyll a green-colored pigment that absorbs sunlight, and allows the plant to make its own food in the process known as photosynthesis . Other types of plastids are the amyloplasts specialized for starch storage, elaioplasts specialized for fat storage, and chromoplasts specialized for synthesis and storage of pigments . As in mitochondria which have a genome encoding 37 genes,plastids have their own genomes  of about 100–120 unique genes and, it is presumed, arose as prokaryotic endosymbionts living in the cells of an early eukaryotic  ancestor of the land plants and algae .

4 Tissue types The major classes of cells differentiate from undifferentiated cells to the tissue structures of roots , stems , leaves and flowers . There are elongated cells with lignified secondary thickening of the cell walls.

5 The plant cells Plant cells are eukaryotic cells that differ in several key aspects from the other eukaryotic organisms. Their distinctive features include. A cell wall composed of cellulose , pectin ,and in many caseslignin, is secret by the vprotoplast on the outside of the cella membrane .

6 THE PLANT CELLS Specialzed cell-to –cell communication pathways known as plasmodesmata pores in the primary cell wall through which the leplsmaemma and endoplasmic reticulum of adjacet cells are continuous.

7 The plant cells Plastids the most notable being the choroplast whch cotains chlorophyll, a green –colored pigment that absorbs sunlight Cell division by construction of a ohragmoplastas a template for building a cell plate late incytokinesis is characteristic of land plants and a few groups of algae

8 The plant cells The sperm of bryophytes and pteridophytes , cycads and have similar to those in animals cells

9 The work in co-operative is very important because it makes work easier


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