TRANSPORT Flashcards
Topic 2 H
to function properly, organisms need to
exchange substances like food molecules and waste wit their environment
the exchange of substances happens through
via diffusion, osmosis, and active transport across the cell membrane
unicellular organisms have ___ surface areas compared to their volume , meaning the distance from surface to centre is___
large
small
why don’t unicellular organisms need specialised exchange surfaces or transport systems
because diffusion, osmosis, and active transport through the cell membrane are sufficient for their needs.
multicellular organisms have bodies composed of
many cells
the multicellular organisms have a ____ distance from surface to centre so diffusion _____ enough
large
not
why is diffusion not enough for multicellular organisms
would be too slow to meet the organism’s needs, so larger organisms require transport systems
what do multicellular organisms have to help with diffusion
transport systems
what is the transport system in animals
circulatory system
what is the transport system in plants
the vascular system
the xylem transports
water and minerals from roots to shoots
phloem transports
amino acids and sugars throughout the plant
