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B2.1 CELLS AND CELL STRUCTURE
Cells= smallest unit of life
Nucleus- control activities of cell + contain DNA
Cytoplasm- Chemical reactions
Cell Membrane- Controls what goes in and out
Mitochondria- energy released in respiration
Ribosomes- protein synthesis
Cell Wall- made of cellulose and gives plant strength and makes rigid
Chloroplasts- absorb light energy
Permanent vacuole- filled with cell sap keeps cell turgid
Flagella…read more

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SPECIALISED
CELLS…read more

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MOVEMENT INTO AND OUT OF
CELLS
Solute= particles in solution
Solvent= liquid in which particles are dissolved
Diffusion= net movement of particles from an area of high concentration to an area of low
concentration
Greater the difference in concentration the faster the rate of diffusion…read more

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B2.2 TISSUES, ORGANS AND ORGAN
SYSTEMS
Cells differentiate so that they can perform specific functions- become specialised
Tissue= group of cells with similar structure and function
Eg. Muscular tissue- contracts for movement
Eg. Glandular tissue- produces substances (enzymes and hormones)
Eg. Epithelial tissue- covers parts of body
Organs= structures of body with specific function
Organ Systems= groups of organs that work together to perform a specific function
Eg. Digestive system
Plant Organs inc. stems roots leaves
Plant Tissue Inc. epidermal tissues- cover plant
Inc. mesophyll- carries out photosynthesis
Inc. xylem and phloem- transport substance…read more

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PHOTOSYNTHESIS= MAKING OF GLUCOSE USING LIGHT
Where? Leaves + mesophyll cells (lots of chloroplasts)
Limiting Factors: Temperature, Light intensity, Carbon Dioxide
Temp- molecules have less K.E so reaction is slower
Light- less energy to power reaction
CO2- less molecules available for reaction…read more

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