Biologie samenvatting Flashcards
Organ
a part of an organism that performs a specific fucntion
organs system
a group of organs that work together to perform a specific function
tap root
the root of a plant grows downwards
lateral root
branches that split off from the tap root
root hairs
thin protrusions often at the ends of roots
root system
all the roots of a plant
minerals
salts dissolved in the water in the soil that plants need for staying alive
food reserves
substances that an organism does not need immediately and saves for later use
stem
the part of a plant between the roots and the leaves
woody plants
plants with stems that are kept sturdy because they contain lots of wood
herbaceous plants
plants with stems that are only sturdy when they can absorb enough water
leaf stalk
the part of a leaf where it is attached to the stem
blade
the flat part of a leaf
veins
structures in a leaf that provide rigidity and transport water and other substances
lamina
the material in a leaf in between the veins
vessels
long, thin tubes in the stem of a plant that transport water, minerals and glucose
vascular bundle
a group of vessels that are next to each other in a plant
vascular system
all the vessels in a plant
cells
the building blocks of an organism
tissue
a group of cells with the same shape and function
extracellular material
a liquid or solid substance in between the cells
epidermis
a layer of cells on the outside of a leaf that protects it against external influences
stomata
smal openings in the leaf of a plant that take carbon dioxide out of the air and give off oxygen
cambium
a layer of cells just inside of the bark of a tree where new wood is formed
annual ring
all the wood in a tree trunk that is formed in a single year
