Cell organisation in plants
Transcript of Cell organisation in plants
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WHAT IS THE FUNCTION OF:FLOWERSTEMLEAFROOTS
WHAT ARE THE CELLS INSIDE THOSE PARTS OF PLANT?
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Cell organisation in plants
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TISSUES 1. Meristematic tissues
2. Permanent tissues
Small cells – thin walls, large nuclei, dense cytoplasm and no vacuole
Young, cell divide actively but not undergo differentiation
at the tips of roots
Epidermal tissues
Ground tissues
Vascular tissues
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Permanent tissues
1.Epidermal tissue• Outermost layer – covers the stems, leaves
and roots of young plants.• Flat and has large vacuole• Wall - covered with cuticle• Root – has root hairs• Chloroplast – guard cells
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Epidermal tissue
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Permanent tissue
2. Ground tissue• parenchyma – thin primary walls and large vacuole ; store sugar and starch ; gives support and shape to herbaceous plants.(leaf)• collenchyma – unevenly thickened cell walls; supports non-woody plants, young stems and petioles.(stem)• sclerenchyma – cell walls uniformly thickened by lignin and may be dead; give support and mechanical strength.(root)
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Parenchyma tissue
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Collenchyma tissue
Thickened cell wall
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Sclerenchyma tissue
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Vascular tissue
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Organs and systems in plants
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Regulating the internal environmentDefinitionWhy need to maintain an optimal
internal environment?Factors that affect the internal
environment?Homeostasis??
- system that regulates its internal environment so as to maintain a stable, constant condition
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Homeostasis
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