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4/12/2016 21.1 Plant Cells and Tissues 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C TEKS 5B, 10B, 10C KEY CONCEPT Plants have specialized cells and tissue systems. The student is expected to: 5B examine specialized cells, including roots, stems, and leaves of plants...; 10B describe the interactions that occur among systems that perform the functions of transport, reproduction, and response in plants; 10C analyze the levels of organization in biological systems and relate the levels to each other and to the whole system 21.1 Plant Cells and Tissues 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C THINK ABOUT IT – DO NOT SHOUT OUT ANSWER Are plant cells eukaryotic or prokaryotic? What are differences b/w plant & animal cells. 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C Plant tissues are made of three basic cell types. • Parenchyma cells are the most common plant cell type. – – – – Found throughout the plant Photosynthesis occurs here (leaves) Storage – large vacuoles; starch (roots & stems) help heal wounds to the plant – can divide throughout their entire life – have thin flexible walls John Alan Elson - http://www.3dham.com/vegetable/Stem-Parenchyma.html 1 4/12/2016 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C Plant tissues are made of three basic cell types. • Collenchyma cells provide support to a growing plant. – they are strong and flexible – still allow growth – most common in younger tissue – celery strings are strands of collenchyma. – they have unevenly thick cell walls (no lignin) – can stretch & change size 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C Plant organs are made of three tissue systems. • Dermal tissue covers the outside of a plant. – protects the plant – secretes cuticle of leaves – forms outer bark of trees 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C Plant tissues are made of three basic cell types. • Sclerenchyma cells are the strongest plant cell type. – second cell wall hardened by lignin (tough & durable) – die when they reach maturity – used by humans to make linen and rope 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C • Ground tissue is found inside a plant. – provides support – stores materials in roots and stems – most commonly made of parenchyma 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C • Vascular tissue transports water, minerals and organic compounds. – two networks of hollow tubes – xylem transports water and minerals – phloem transports photosynthetic products stem leaf root 2 4/12/2016 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C Videos • https://youtu.be/zHp_voyo7MY • https://youtu.be/-rGetleD-DI 3