Ivy stem. Coloured scanning electron micrograph (SEM) of the surface of an ivy plant stem. The star- shaped trichomes, a type of modified hair cell, may function in preventing water loss, or in defending the plant against insects. Several stomata are visible, for example in a line from lower left to centre. These pores allow for gaseous exchange between the air and the plant's cells. There are fewer stomata on plant stems than on the leaves.
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