Parenchyma Flashcards
Parenchyma Shape
isodiametric or elongated cells.
Parenchyma contains
chloroplast, chromoplasts and leucoplasts.
Cells containing chloroplasts
chlorenchyma
Parenchyma cell walls
Thin and permeable to water and permit the passage of solutes
Characteristics of parenchyma
large, central vacuole with nucleus and thin layer of cytoplasm
pushed to the periphery
Function of parenchyma
Unspecialised tissue that can be diffretiented Store food Provide support Potentially meristematic photosynthesis Chromoplasts
Epidermis shape
Layer of elongated flattened cells, one cell thick
Epidermis secretes?
Cutin (layer of waxy cuticle on the outer surface of epidermis)
Epidermis characteristics (whats special)
specialized guard cells – enclosing a stomal pore in leaves
Epidermis functions
Protective layer Waxy cuticle: Water loss and pathogens Transparent layer to allow light to reach mesophyll Stomatal pore allows gas exchange.
Palisade mesophyll
collumn shaped below epidermis, contains many chloroplasts for photosynthesis
Spongy mesophyll
Isodiametric/irregular-shaped
loosely packed for gas exchange
Fewer chloroplast to carry out photosynthesis
Endodermis location and shape
Single cell ring between cortex and pericycle tissue
Endodermis function
Store starch, regulate movement of water, maintain root pressure by secreting mineral ion into xylem vessel.
Pericycle
Between endodermis and central vascular tissue
Can divide divide to produce lateral roots
and involve in secondary growth of
roots
