21.1 Plant Cells and Tissues Reproductive Adaptations Contribute to Angiosperm Success Anatomy of a...

21.1 Plant Cells and Tissues Reproductive Adaptations Contribute to Angiosperm SuccessReproductive Adaptations Contribute to Angiosperm Success

Anatomy of a Typical Flower Anatomy of a Typical Flower

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21.1 Plant Cells and Tissues

Adaptations:

• Sepals• Petals• Stamen• Carpal/Pistil

20.120.1 Reproductive Adaptations Contribute to Angiosperm SuccessReproductive Adaptations Contribute to Angiosperm Success

21.1 Plant Cells and Tissues

Adaptations

• Double Fertilization– Embryo– Endosperm

• Seeds– Seed coat– Embryo– Cotyledon

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Embryo Embryo

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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21.1 Plant Cells and Tissues

– provides support – stores materials in roots and

stems – Photosynthesis (in the shoot)

• Ground tissue is found inside a plant.

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

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stem

leaf

root

Tissue Types #1 & #2Tissue Types #1 & #2

21.1 Plant Cells and Tissues

– xylem transports water and minerals

– phloem transports photosynthetic products (sugar)

• Vascular tissue: hollow tube shaped, used for transport

20.220.2 Tissue Type #3Tissue Type #3

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– Photosynthesis and Cellular

Respiration– help heal wounds to

the plant – have thin flexible walls &

large central vacuole

20.220.2 Cell Type #1Cell Type #1

21.1 Plant Cells and Tissues

– they are strong and flexible.– celery strings are strands of collenchyma.– they have unevenly thick cell walls.

• Collenchyma cells provide support to a growing plant.

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21.1 Plant Cells and Tissues

– second cell wall hardened by lignin– die when they reach maturity – used by humans to make linen and rope

• Sclerenchyma cells are the strongest plant cell type.

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