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Cells

Cell Function Adaptation

Leaf palisade cell Carries out - Packed with chloroplasts containing light-
photosynthesis absorbing pigment (chlorophyll)
- Regularly shaped, closely packed cells form
continuous layer efficient absorption of sunlight.



Root hair cell Absorbs water and - Long 'finger-like' projection large surface area
minerals from the for absorption…

Page 2

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Cells




Structure Function

Nucleus Contains genetic material which controls cells behaviour

Cell membrane Controls what passes in and out of cell

Cytoplasm Where chemical processes (controlled by enzymes) and anaerobic
respiration occur

Mitochondrion/a Site of aerobic respiration

Cell wall (made of cellulose) To strengthen and give support to cell

Chloroplast…

Page 3

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Cell




nerve



Organ
Tissue




function
function




Organism
organisms




leaf, flower




the organism
Organ system

tissues working




skeletal system
nervous system,
E.g. blood, bone.




perform specific
- Made up of cells
cells, palisade cells




a specific activity




basic life processes
- Basic unit in living




specific function for
similar in structure…

Page 4

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Cells
Diffusion
- Movement of molecules from a higher to a lower concentration until equilibrium is reached
- Gases move through plasma membranes by diffusion
- Factors affecting rate:
- Distance: e.g. membranes in lung are very thin
- Concentration gradients: the steeper the gradient, the faster the diffusion rate…

Page 5

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Cells
- When answering a question about osmosis, state:
a) Where the highest water potential is
b) Direction of movement
Experiment Descript ion
c) Through partially permeable membrane
d) Resulting in increase/decrease of mass Water enters visking
tubing (proven by
increase in mass)

- Experiments
a) Egg placed in water…

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