Transcript 21.1 Plant Cells and Tissues

Reproductive
Adaptations Contribute to
20.1
21.1 Plant
Cells and Tissues
Angiosperm Success
Anatomy of a Typical Flower
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21.1
Reproductive
Adaptations
Plant
Cells and
TissuesContribute to
Angiosperm Success
Adaptations:
•
•
•
•
Sepals
Petals
Stamen
Carpal/Pistil
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21.1
Plant Cells and Tissues
Adaptations
• Double Fertilization
– Embryo
– Endosperm
Embryo
• Seeds
– Seed coat
– Embryo
– Cotyledon
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21.1
Plant Cells and Tissues
Asexual Reproduction In Angiosperms
• Vegetative Reproduction: dropped stems or shoots that
establish new roots and become clones.
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21.1 Plant Cells and Tissues
KEY CONCEPT
Plants have specialized cells and tissue systems.
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21.1 Plant Cells and Tissues
A Plant’s Roots and Shoots System
• Root system
– Fibrous Root
vs Tap Root
• Shoot system
– Stems
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Tissue
Types
& #2
21.1 Plant
Cells
and#1Tissues
Plant organs are made of three tissue systems.
• Dermal tissue covers the
outside of a plant.
– protects the plant
stem
– secretes cuticle of leaves
– forms outer bark of trees
• Ground tissue is found
inside a plant.
– provides support
– stores materials in roots
and stems
– Photosynthesis (in the
shoot)
leaf
root
Tissueand
TypeTissues
#3
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21.1 Plant Cells
• Vascular tissue: hollow tube shaped, used for transport
– xylem transports water
and minerals
– phloem transports
photosynthetic products
(sugar)
Cell Type
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21.1 Plant Cells
and #1
Tissues
Plant tissues are made of three basic cell types.
• Parenchyma cells are the
most common plant cell
type.
– store starch, oils and
water
– Photosynthesis and
Cellular Respiration
– help heal wounds to
the plant
– have thin flexible walls
& large central vacuole
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20.2 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.
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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