Adaptations for gas exchange 2.2

Question 1

What are the features of good gas exchange surface?

Answer 1

-Large surface area
-Moist
-Thin
-Permeable
-Maintain diffusion gradient

Question 2

What is the Malate theory? (opening)

Answer 2

1) Light is trigger + generates ATP
2) K+ are actively transported into guard cells
3) Starch -> Malate
4) Malate is soluble + dissolves, lowering water potential inside cell
5) Osmosis, cells become turgid and bend

Question 3

What is the malate theory? (closing)

Answer 3

1) No light, no ATP generated
2) K+ leaves guard cells
3) Malate -> Starch
4) water potential increase in cell
5) Osmosis, cells become flaccid

Question 4

What is gas exchange in amoeba?

Answer 4

-Respiratory surface is cell membrane
-Large surface area:volume ratio
-Thin and flat
-Lives in water

Question 5

What is gas exchange in an flatworm?

Answer 5

-Respiratory surface is outer body covering
-Thin and flat

Question 6

What is gas exchange in an earthworm?

Answer 6

-Respiratory surface is skin
-Terrestrial animal, lives in damp areas
-Low metabolic rate
-Moist
-Capillaries directly under skin
-Haemoglobin maintains conc gradient