Question

a) Which animal belongs to which subphylum? (MCQ, 1 point)

A) the dog tick belongs to Chelicerata; the body louse belongs to Hexapoda  

B) the dog tick belongs to Hexapoda; the body louse belongs to Chelicerata

C) the dog tick belongs to Hexapoda; the body louse belongs to Hexapoda

D) the dog tick belongs to Chelicerata; the body louse belongs to Chelicerata

b) Explain why by stating the characteristicsthat enabled you to identify each. Word limit = 100 words.

Answer 1

a.The answer is A.That is dog ticks belongs to chelicerata;the body louse belongs to Hexapoda.

b.

Chelicerata;Body contains anterior six segmented cephalothorax or prosoma,a posterior thirteen segmented abdomen or opisthosoma which is further diveded into mesosoma and metasoma.Prosoma bears 6 pairs of appendages,the first pair is modified for feeding called chelicerae.Antennae and jaws are absent.Respiratory organs are book gills or book lungs or trachea.

Hexapoda;

Body consists of head ,thorax and abdomen.Head contains a pair of compound eyes, antennae, maxillae, mandible and unpaired labium.Thorax contains 3 segements each segment contains a pair of legs hence the name Hexapoda.Thorax also contains one or two pairs of legs or they may be absent in some.Respiratory organ is trachea.