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Summary OCR A/AS-Level Biology 2.6.7 Plant Tissues
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Revision Summary of key knowledge from OCR A/AS-Level Biology 2.6.7 Plant Tissues.
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Plant TissuesEpidermal Tissues
Flattened cells lacking chloroplasts (except guard cells)
Protective covering over leaves, stem and roots
Waxy cuticle prevents water loss
Vascular Tissues
Xylem:
Water and minerals
One-way (roots to leaves)
Dead, impermeable lignified cell walls
No end walls
Phloem:
Organic molecules
Two-way
Living, cellulose cell walls
End walls with sieve plates
Meristematic Tissues
Contain stem cells
Root and shoot tips and in cambium of vascular bundles
Thin cell walls with little cellulose
No chloroplasts and small vacuole
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