Question

Please, give your answer pointwise means for first point what is meaning,and second point what is meaning


1. Cosmopolitan in distribution found in aquntie terrestrial and acrial forms.
Some are ectoparasitic und vectors of disease
2. Body have jointed appendages or legs (which are modified to different structures to
perform different functions like jaws, gills, walking legs, puddle). There may be 3 pairs, 4
pairs, 5 pairs, many pairs.
3. Body is triploblastic.
4. Bilaterally symmetrical.
5. Organ system level of organization.
6. Body is divisible into head, thorax and abdomen.
7. This is the first group to develop a true head, which contains sense organs and feeding
organs specialized for their particular habitats.
8. Body is covered with chitinous exoskeleton.
9. They are haemocoelomate. Coelom i.e. body cavity is filled with blood or fluid.
10. Head bears a pair of compound eyes and antenna.
11. Locomotion takes place by jointed appendages.
12. Digestive
system is complete, straight and well developed
The mouth bears mouth parts for ingestion of foods. Mouths are modified for chewing,
biting, sponging, piercing, siphoning,
13. Respiration takes place by general body surface or gills (in Crustaceans) or trachea ( in
insects, diplopoda and chilopoda) or booklungs (Arachnida) and book gills (in king
cobra).
14. Circulatory system is of open type i.e. do not have blood vessels and enters directly into
the body chambers. The blood is colorless.
15. Excretion takes place through Malphigian tubules (in terrestrial form) or green glands or
coxal
glands
aquatic
forms)
Nervous system is of annelidian type, which consists of brain and ventral nerve cord.
16. Unisexual i.e. sexes are separate.
17. Fertilization is internal or external
18. They are either oviparous or ovoviviparous
19. Development may be direct or indirect.
20. Sensory organ include antennae, sensory hairs for touch and chemoreceptor, simple and
compound eyes, auditory organs (in insects) and statocysts (in crustacean),​

Answer 1

Answer:

2.

Explanation:

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