General Classification

Question 1

Name two classes of the Phylum Arthropoda

Answer 1

Insecta
Arachnida

Question 2

Name 3 orders that belong to the class Insecta

Answer 2

Diptera(flies)
Siphonaptera(fleas)
Pthiraptera(lice)

Question 3

The exoskeleton of insects contain layers of cuticle secreted by an epidermis. Name these layers

Answer 3

Epicuticle
Exocuticle
Endocuticle

Question 4

The exocuticle and endocuticle contain a substance made of a protein and a polysaccharide called

Answer 4

Chitin

Question 5

Explain how insects carry out gaseous exchange

Answer 5

1. For insects lacking a waxy epicuticle-simple diffusion
2. Cuticle punctured by small openings called spiracles (stigmata in mites and ticks)
   Spiracles/stigmata»tracheae»tracheoles

Question 6

How do terrestrial arthropods reduce water loss??

Answer 6

In periods of respiratory inactivity respiratory openings are kept closed by valves which open periodically

Question 7

Name components of the circulatory system of insects

Answer 7

Haemocoel
Haemolymph
Dorsal vessel(‘heart’)

Question 8

What part acts as the heart of insects

Answer 8

The dorsal vessel with openings called ostia

Question 9

Name 3 types of eyes found in insects

Answer 9

Simple eyes( larval stages)
Ocelli
Compound eyes

Question 10

What are ocelli in insects

Answer 10

Sensory organs that contain sensory cells and an overlying corneal lens

Question 11

Name 3 suborders of the order Diptera

Answer 11

Nematocera
Brachycera
Cyclorrhapha

Question 12

Compound eyes have long cylindrical units each covered by a translucent cornea(facet). These units are known as

Answer 12

Ommatidia