1.

Give two example of each of the following : (a) Animals having external gills (b) Anaerobes (c ) Animals having internal gills ( d ) Animals groups showing tracheal respiration (e ) Animals reveling buccopharyngeal respiration

Answer» (a) Aquatic annelids (e.g. lug worm , Arenicold) , larvae of damsel fly some amphibians e.g. Necturus.
( b) Certain bacteria , parasitic worms (Ascaris , tape worm)
(c ) Prawn mussel (Unio) apple snail (Pila ) , fishes.
(d ) Insects centipedes and millipedes.
(e ) Frog , toad.


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