Definitions

Cell
A smallest unit of structure and function of living organisms
Tissue
A group of cells working together to perform a specific function
Organ
A group of tissues working to perform one or more functions

Magnification

Magnification

Magnification = Size of an image
                           Actual size

For exampe the question is

*400

1) Make a large diagram of a cell
Ans ) Draw a large diagram of any cell


2) Find Magnification of you drawing

• First find the length of RBC in cell
• Suppose x=3 cm
• Find the actual size of RBC

Magnification= Image size
                          Actual size
400 =        3        
          Actual size
Actual size =   3  
                      400
Actual size = 0.0075

• find the length of drawn image
• suppose it is 10 cm

Magnification =    10    
                           0.0075
Magnification = x1333.33

Note:

• If the magnification is not given ( x400 ) then leave the first step to find the actual size
• x is necessary to use in the answer of magnification

Cell organelles

Organelles in cell

     Cell wall

• Made of cellulose
• found in plants
• prevent cell from bursting

    Cell membrane

• Found in both plants and animals
• controls the movement of substances into and out of the cells

    Chloroplast

• A double membrane bond of cell organal
• found in plants
• contains a green pigment, chlorophyll
• traps sunlight
• converts it into chemical energy
• for the synthesis of carbohydrates

   Nucleus

• Found in both plants and animals
• Controls the reproductive activity of cell
• repairs the worn off cells

Differences b/w animal and plant cell

    Difference b/w animal and plant cell
 
    Plant cell

• Large size
• Regular shape
• Cell wall present
• Centrioles absent
• Chloroplast present
• Permanent, large vacuole
• Both mitosis and meiosis occur

   Animal cell

• Small size
• Irregular shape
• Cell wall absent
• Centrioles present
• Chloroplast absent
• Temporary, small vacuole
• Meiosis occur
  

Cell structure and component

     How to prepare a microscope

• Take a glass slide
• Place the specimen on the slide
• Pour a few drops of dye on the slide
• Place the cover slide on it
• Soak the excess stain
• Place the slide on the stage
• Rotate the nose piece to adjust the power of the objectives
• Looking through the slide of the stage with the course adjustment knob
• Looking though the eye piece, lower down the stage with fine focusing lens

    Reading your observation

• Taking a photomicrograph
• Making a diagram