Transcript 21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C

21.1 Plant Cells and Tissues
TEKS 5B, 10B, 10C
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
TEKS 5B, 10B, 10C
KEY CONCEPT
Plants have specialized cells and tissue systems.
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.
– store starch, oils and
water
– help heal wounds to
the plant
– have thin flexible walls
21.1 Plant Cells and Tissues
TEKS 5B, 10B, 10C
• Collenchyma cells provide support to a growing plant.
– they are strong and flexible.
– celery strings are strands of collenchyma.
– they have unevenly thick cell walls.
21.1 Plant Cells and Tissues
TEKS 5B, 10B, 10C
• Sclerenchyma cells are the strongest plant cell type.
– second cell wall hardened by lignin
– die when they reach maturity
– used by humans to make linen and rope
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
• Ground tissue is found inside a plant.
– provides support
– stores materials in roots and stems
– most commonly made of parenchyma
TEKS 5B, 10B, 10C
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