basic components of living systems: the ultrastructure of plant cells

Question 1

cell wall

Answer 1

cellulose
freely permeable so substances can pass in and out of cell
cell wall give shape
contents of cell press against cell wall making it rigid
cell wall acts as defence mechanism protecting contents against pathogens

Question 2

which structures are unique to plant cells

Answer 2

vacuoles
chloroplasts

Question 3

vacuole structure

Answer 3

membrane lined sacs in cytoplasm containing cell sap

Question 4

vacuole function

Answer 4

important in the maintenance of turgor
so contents of cell push against cell wall giving rigid framework

Question 5

vacuole membrane

Answer 5

tonoplast
selectively permeable some molecules can move in

Question 6

what are chloroplasts

Answer 6

organelles responsible for photosynthesis in plant cells

Question 7

where are chloroplasts found

Answer 7

in the green part of plansts
leaves and stems
but not roots

Question 8

chloroplasts structure

Answer 8

double membrane
fluid enclosed called stroma
internal network of membranes form flatened sacs called thylakoids
multiple thylakoids are called granum
joined by membranes called lamellae

Question 9

what does grana contain

Answer 9

chlorophyll pigments where light dependant reactions occur during photosynthesis
can make their own proteins