6.2: Gas exchange in insects + single celled organisms

Question 1

Test

Answer 1

Test

Question 2

Single celled organisms are small and therefore have a…

Answer 2

large SA to volume ratio

Question 3

What covers the body surface of single celled organisms

Answer 3

a cell surface membrane

Question 4

Diffusion occurs across … in single celled organisms

Answer 4

their body surface

Question 5

Internal network of tubes for gas exchange in insects

Answer 5

tracheae

Question 6

What supports the trachea in insects

and role

Answer 6

strengthened rings

prevents them from collapsing

Question 7

Tracheoles

Answer 7

smaller dead-end tubes that the trachea divide into

Question 8

Where are tracheoles

Answer 8

extend through out all the body tissues of the insect

Question 9

From a tracheole to a body cell is a

Answer 9

short diffusion pathway

Question 10

Gas exchange in insects occurs

Answer 10

along a diffusion gradient

Question 11

Mass transport in insects

Answer 11

the contraction of muscles in insects can squeeze the trachea enabling mass movements of air in and out

Question 12

Mass transport role

Answer 12

speeds up the exchange of respiratory gases

Question 13

End of the tracheoles are

Answer 13

filled with water

Question 14

Why are the ends of the tracheoles filled with water

Answer 14

to move into the cells from the tracheoles by osmosis and increase the water potential after it decreases from the production of soluble lactate

Question 15

What is produced from anaerobic respiration in insects

Answer 15

soluble lactate

Question 16

Spiracles

Answer 16

Tiny pores on the body surface where gases enter and leave the trachea through

Question 17

What can happen when the spiracles are open

Answer 17

water evaporates from the insect

Question 18

Limitation of gas exchange in insects

Answer 18

It requires a short diffusion pathway which means the insect must be small in size