lesson 7 plant cell specialisation Flashcards
most plant cells are _________
meaning….
specialised
they have special adaptations which help them carry out their particular function
when cells become specialised, scientists call this process _______
differentiation
why do hairs increase the surface area of the root
so it can absorb more water and dissolved materials more effectively
what does the root hair do
increase the surface area of the root
why don’t root hair cells contain chloroplasts
because they’re underground
where are xylems found and what do they form
they are found in the plants stem
they form long tubes
what do the long tubes do in xylem cells
they carry water and dissolved minerals from the roots to the leaves
xylem cells have very thick walls containing ____
and it does what
lignin which provides support to the plant
because the cell walls are sealed with lignin, the causes the xylem cells to _____
die
the end walls between the cells have completely broken down meaning what…
the cells now form a long tube so water and dissolved minerals can flow easily
xylem cells have got no..
meaning what
nucleus, cytoplasm,
vacuole or chloroplasts
meaning they have no internal structures at all
the fact that xylem cells have no internal structure at all, means what
makes it easier for water and minerals to flow
phloem tubes carry what
dissolved sugars up and down the plant
phloem tubes contain two different types of cells which are
phloem vessel cells
and sieve plates
phloem vessel cells have no..
nucleus and are only limited to cytoplasm
