Protista

Question 1

unicellular

Answer 1

an organism that is composed of a single cell

Question 2

eukaryotic

Answer 2

contains a nucleus and membrane bound organelle

Question 3

heterotrophic

Answer 3

organisms that are not capable of making their own food

Question 4

osmosis

Answer 4

the movement of water across a semi permeable membrane from a region of high water concentration to low water concentration

Question 5

passive diffusion

Answer 5

does not require energy eg osmosis

Question 6

osmoregualtion

Answer 6

the control or balance of water and salt levels in an organism

Question 7

osmosis in a plant cell

Answer 7

in a more concentrated solution it will wilt

Question 8

features of kingdom protista

Answer 8

unicellular
eukaryotic
heterotrophic
lives in fresh water
eg amoeba, algae

Question 9

cell membrane

Answer 9

semi permeable

Question 10

cytoplasm

Answer 10

divided into
endoplasm (grainy)
ectoplasm (clear)

Question 11

pseudopodia

Answer 11

allows movement of amoeba by:
pseudopodia extend in desired direction
cytoplasm moves into pseudopodia
cell moves

engulf and digest prey by:
amoeba kill prey by secreting acid and digestive enzymes
pseudopodia engulf prey

Question 12

contractile vacuole

Answer 12

function: osmoregulation
amoebas cytoplasm is more concentrated than the surrounding fresh water where it lives
without the contractile vacuole amoeba would expand and burst

Question 13

how does the contractile vacuole work

Answer 13

1. water enters amoeba by osmosis
2. excess water enters contractile vacuole
3. contractile vacuole swells and moves to the edge of the cell
4. contractile vacuole bursts and expels water from the edge of the cell
5. cycle repeats

Question 14

contractile vacuole process not needed in marine/sea water

Answer 14

solute concentration in amoeba similar to external environment so water moves in and out of amoeba by osmosis