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Plant Tissues and Morphology

Plant Tissues and Morphology. A mature vascular plant (any plant other than mosses and liverworts), contains several types of differentiated cells. These are grouped together in tissues. Some tissues contain only one type of cell. Some consist of several. . Meristematic.

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Plant Tissues and Morphology

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  1. Plant Tissues and Morphology A mature vascular plant (any plant other than mosses and liverworts), contains several types of differentiated cells. These are grouped together in tissues. Some tissues contain only one type of cell. Some consist of several.

  2. Meristematic • The main function of meristematic tissue is mitosis. The cells are small, thin-walled, with no central vacuole and no specialized features. • Meristematic tissue is located in • the apical meristems at the growing points of roots and stems. • the secondary meristems (lateral buds) at the nodes of stems (where branching occurs) and in some plants, • meristematic tissue, called the cambium, that is found within mature stems and roots. • The cells produced in the meristems soon become differentiated into one or another of several types.

  3. Ground Tissues • Ground Tissues general tissues of the plant cell walls that function in • Photosynthesis • Storage • Support • 3 Types: • Parenchyma • Sclerenchyma • Collenchyma

  4. Parenchyma • Most common • Least specialized • Lack secondary walls • Food storage • Photosynthesis • Found mainly in the leaves

  5. Collenchyma • Thick flexible cell walls • Grouped in cylinders to support growth • Lack secondary walls • Elongate with the stems and leaves as they grow • Provide mechanical support to plants would find these in the petiole.

  6. Sclerenchyma • Support • Thick secondary walls • Strengthened by lignan • Dead at maturity and lack nuclei • Mainly xylem • Found in stems and leaf veins

  7. Dermal Tissues • Single layers of cells for protection of the young plant. • Epidermis • Cuticle • Root hairs

  8. Vascular Tissue • Two types : Xylem and Phloem • Xylem • Consists of Tracheids and Vessel Elements • Tracheids are lignin strengthened • Vessel Elements are wider, shorter and thinned walled • Phloem • Consists of sieve tube members and companion cells • Sieve tube members fluid flows through these dead cells • Companion cells accompany sieve tubes and contain a nucleus and connect to the seive tube through plasmadesmata.

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