21.1 Plant Cells and Tissues
KEY CONCEPT
Plants have specialized cells and tissue systems.
21.1 Plant Cells and Tissues
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
• 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
• 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
– makes up the hard or gritty part of a fruit or vegetable
21.1 Plant Cells and Tissues
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
21.1 Plant Cells and Tissues
• 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
21.1 Plant Cells and Tissues
Which type of cell is found in the hard or gritty parts of
fruits and vegetables?
A.
B.
C.
D.
Collenchyma
Sclerenchyma
Parenchyma
Plasmodesmata
21.1 Plant Cells and Tissues
Plant cells that have thin walls and store starch, oils,
and water are
A.
B.
C.
D.
Parenchyma
Collenchyma
Sclerenchyma
Vascular cells
21.1 Plant Cells and Tissues
Dead parenchyma cells that make up bark form a type of
A.
B.
C.
D.
Collenchyma tissue
Vascular tissue
Dermal tissue
Ground tissue
21.1 Plant Cells and Tissues
A plant’s ground tissue is found
A.
B.
C.
D.
In its outer layer
Only in its leaves
Above the ground
Throughout the plant
21.1 Plant Cells and Tissues
Water and dissolved minerals are carried from the roots
to the rest of the plant by the
A.
B.
C.
D.
Dermal tissue
Ground tissue
Xylem
Phloem