gas exchange

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S B R V X V U U L B G S W K N T V Y B W J
X W M C X E A V S Y V L U K U R A H X D F
K B S T K N C T T D S L F R S A O W D N K
P A C H S T Q N Q M E A P L E C W A Q N H
H G D I O I K D T N L W L F L H N T D T J
R R W N T L Y W G I O E W R C E U E H T V
C S H W T A O B P P E L B J A A T R K E O
S U I A R T M W I S H B A V R E Q P H D X
C O Q L K I W B E Y C A B Y I S O R N D L
S K A L K O B L V V A E Q D P U U O T C J
F E G S N N C O S N R M O H S K M O U M M
V H Q W B S J M L L T R L O X D S F C V I
H A U F U W H P X P R E D Q R P D W L K W
V X P M C A X I J V C P C T M J E X N X I
T V Q L E U T I N Y H A I R S D L H U X T
G D I F F U S I O N G R A D I E N T M D N
Q G T U Q V K W P Q M N Q K R O B F P D O
S A H Q K P B B B G Y I Q E E G D N S V Q
S U Q T U N X C R E T F U F K G B S Y P M
P J L B L W V T L W I Q S G S O O S A J K
J H B N B W C C T I O M V L I V D M U N I

Clues

  • To reduce water loss insects have what around their spiracles? (4, 5)
  • What are pores on the tracheae called? (9)
  • What do the tracheae branch off into? (10)
  • What do they use to close their spiracles to control water loss? (7)
  • What feature of their surface helps with water control? (10)
  • What is another way? (11)
  • What is another? (9, 5)
  • What is one adaptation of teh tracheoles to increase diffusion rate? (4, 5)
  • What is one way respiratory gases move in and out of the tracheae? (9, 8)
  • What structure do insects use to exchange gas? (8)

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