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To alter the size of the pupil, so the correct intensity of light is allowed through. Enough light is let through to allow clear vision, but not so much light that the retina might become damaged.

Mitosis and meiosis refer to the way cells reproduce. 
Mitosis sees the cell divide in two, forming two genetically identical diploid cells. The reproduction of cells means mitosis is used by the bod...

Plants that live in these areas need to minimise the rate at which they transpire in order to preserve as much water as possible. 

One way they do this is by reducing their surface area:v...

The chloroplast has a cell membrane like most cells/organelles. They are long and oval shaped with a similar shape/size to bacteria. Inside the organelle, the grana stack up like disks on top of one anoth...

White blood cells in the body can attack pathogens, which are micro-organisms which cause disease. 

The white blood cells can ingest the pathogen, produc...