Gas Exchange Exam Questions And Answers Already Graded A+
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1. 1. many alveoli/ alveoli walls folded to give 7. flow of
large SA water across
2. many capillaries give large SA gills in one
3. = fast diffusion direction
4. alveoli/capillary walls/epithelium thin to 8. ventilation
system to
give a short diffusion distance
maintain
5. flattened/ squamous epithelium water flow
6. so short diffusion distance 9. blood
7. giving fast diffusion circulation
8. ventilation/circulation to maintain
9. maintains a diffusion/ concentration blood flow
gradient
10.so fast diffusion/ exchange can always
occur
2. 1. trachea and bronchi and bronchioles
2. down pressure gradient
3. down diffusion gradient
4. across squamous alveolar epithelium
5. across capillary
endothelium/epithelium into blood
3. 1. counter current/ blood flow in opposite
direction to water flow
2. giving maximum distance for oxygen to
flow in and CO2 out/ gas exchange
3. description of how a counter current
works
4. gill lamellae give a large SA
5. thin surface of lamellae/ short distance
between surface of lamellae and blood
capillaries
6. lamellae held edge on to water flow
, Gas Exchange Exam Questions And Answers Already Graded A+
Verified
Describe and explain how the lungs are adapted to allow rapid gas
exchange of oxygen between air in the alveoli and blood in the capillaries
(5-10)
Describe how oxygen in the air reaches capillaries sur- rounding
alveoli in the lungs. Details of breathing are not required. (4-5)
Describe the counter current principle of gas exchange in fish (5-9)
, Gas Exchange Exam Questions And Answers Already Graded A+
Verified
4. 1. exoskeleton/ cuticle/ outer covering ii) gas
2. is waterproof exchange
3. insect has small SA to volume ratio takes place
4. which reduces the overall area over which in the alveoli
water can be lost not in the
5. spiracles can be closed trachea
6. to prevent water loss through the
spiracles
5. 1. rolled leaves - reduces water potential
gradient/ air movement over stomata/
traps air which be- comes saturated/
reduces surface area
2. sunken stomata - reduces water potential
gradi- ent/ air movement across stomata/
traps air which becomes saturated
3. thick cuticle - reduces circular
transpiration/ greater diffusion distance
4. hairs - traps air which becomes saturated
5. reduced leaves/spines - less surface area/
fewer stomata for evaportaion
6. 1. small alveoli give larger surface area
2. for diffusion
7. i) less oxygen/ ore CO2/ more water vapour
, Gas Exchange Exam Questions And Answers Already Graded A+
Verified
Describe how the insect is adapted to ensure minimal water loss and
explain how these adaptations help min- imise water loss (4-6)
Describe and explain how three structural features re- duce the rate of
transpiration in xerophytic plants (4-5)
QP Q1a) In the lungs, the alveoli are the site of gas ex- change
A larger number of small alve- oli is more eflcient in gas ex- change
than a smaller num- ber of larger alveoli. Explain why (2)
Qp Q1c) Just before a person starts to exhale, the composi- tion of the
air in an alveolus
Verified
1. 1. many alveoli/ alveoli walls folded to give 7. flow of
large SA water across
2. many capillaries give large SA gills in one
3. = fast diffusion direction
4. alveoli/capillary walls/epithelium thin to 8. ventilation
system to
give a short diffusion distance
maintain
5. flattened/ squamous epithelium water flow
6. so short diffusion distance 9. blood
7. giving fast diffusion circulation
8. ventilation/circulation to maintain
9. maintains a diffusion/ concentration blood flow
gradient
10.so fast diffusion/ exchange can always
occur
2. 1. trachea and bronchi and bronchioles
2. down pressure gradient
3. down diffusion gradient
4. across squamous alveolar epithelium
5. across capillary
endothelium/epithelium into blood
3. 1. counter current/ blood flow in opposite
direction to water flow
2. giving maximum distance for oxygen to
flow in and CO2 out/ gas exchange
3. description of how a counter current
works
4. gill lamellae give a large SA
5. thin surface of lamellae/ short distance
between surface of lamellae and blood
capillaries
6. lamellae held edge on to water flow
, Gas Exchange Exam Questions And Answers Already Graded A+
Verified
Describe and explain how the lungs are adapted to allow rapid gas
exchange of oxygen between air in the alveoli and blood in the capillaries
(5-10)
Describe how oxygen in the air reaches capillaries sur- rounding
alveoli in the lungs. Details of breathing are not required. (4-5)
Describe the counter current principle of gas exchange in fish (5-9)
, Gas Exchange Exam Questions And Answers Already Graded A+
Verified
4. 1. exoskeleton/ cuticle/ outer covering ii) gas
2. is waterproof exchange
3. insect has small SA to volume ratio takes place
4. which reduces the overall area over which in the alveoli
water can be lost not in the
5. spiracles can be closed trachea
6. to prevent water loss through the
spiracles
5. 1. rolled leaves - reduces water potential
gradient/ air movement over stomata/
traps air which be- comes saturated/
reduces surface area
2. sunken stomata - reduces water potential
gradi- ent/ air movement across stomata/
traps air which becomes saturated
3. thick cuticle - reduces circular
transpiration/ greater diffusion distance
4. hairs - traps air which becomes saturated
5. reduced leaves/spines - less surface area/
fewer stomata for evaportaion
6. 1. small alveoli give larger surface area
2. for diffusion
7. i) less oxygen/ ore CO2/ more water vapour
, Gas Exchange Exam Questions And Answers Already Graded A+
Verified
Describe how the insect is adapted to ensure minimal water loss and
explain how these adaptations help min- imise water loss (4-6)
Describe and explain how three structural features re- duce the rate of
transpiration in xerophytic plants (4-5)
QP Q1a) In the lungs, the alveoli are the site of gas ex- change
A larger number of small alve- oli is more eflcient in gas ex- change
than a smaller num- ber of larger alveoli. Explain why (2)
Qp Q1c) Just before a person starts to exhale, the composi- tion of the
air in an alveolus
