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Lecture 7

BIOL-1507EL Lecture 7: Types of Tissues in Plants

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Nasserulla Sabah

Lecture 7 Tissues types in plants - dermal tissues (epidermis)  closely packed  the walls of the outer epidermal cell covered with waxy cuticle  the epidermal cell contain stomata (guard cells and the stoma)  the root epidermal cells are with root hairs that increase the surface area of the root for absorption of water and minerals - in older woody plants the epidermis of the stem is replaced by the cork tissue, the cork is the outer covering of the bark of the tree ground tissues: parenchyma: - these are the least specialized cell types and are found in all organs of the plant - they may contain chloroplast and carry on photosynthesis - some may store the product of photosynthesis, such as carbohydrates - parenchyma cells can divide and give rise to more specialized cells - parenchyma cells stay alive at maturity (contain nucleus and protoplasm) Collenchyma: - they are like parenchyma except they have thicker walls, the thickness is uneven and usually occurs in the corner of the cells - collenchyma cells often form bundles beneath the epidermis they gi
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