Insect

Question 1

How is an insect adapted to prevent water loss

Answer 1

Carbohydrate outer skeleton
Small spiracle pores that open and close
Spiracles and tracheolos line the insect

Question 2

Spiracles?

Answer 2

Small pores that open and close due to a valve they close to prevent water loss

Question 3

Tracheae

Answer 3

Internal network of tubes supported by rings of chitin

Question 4

Tracholes

Answer 4

Trachea divide into smaller tubes that end and penetrate every end of the body

Question 5

3 movement processes

Answer 5

Diffusion
Mass transport
Changing extent to which the tracholes are filled with water

Question 6

Diffusion

Answer 6

Diffusion gradient set up as cells are respiring and O2 is used up so the conc G falls towards the end of the tracheols = diffusion gradient causes O2 to diffuse in and CO2 produced to diffuse out

Question 7

Mass transport

Answer 7

Contraction of muscles in insect can squeeze the trachea causing mass movements of air in and out

Question 8

Ends filled with water

Answer 8

During periods of major activity the muscle cells respire carrying out anaerobic respiration. These lactate which is soluble and lowers the water potential of the cells. Water therefore moves into the cells by OSMOSIS. Decreases in volume.