Question

Write at least 10 features of phylum arthropoda?​

Answer 1

Phylum Arthropoda

1. Phylum arthropoda is the largest phylum of kingdom animalia which includes insects. Over two- third of all named species on earth are arthropods.

2. Arthropods are found in water,land,sea, in plant and animal. They are colonial , gregarious, shows parental care.

3. Body is bilateral.

4. They are Triploblastic animals.

5. Organ level of organisation is found in them.

6. Segmented and Coelomate. Arthropoda have various shapes with external segmented body.

7. Body is mostly divided into three regions at thorax and abdomen.

8. They have jointed appendages(Legs) this is the most specific characteristics of arthropods.

9. Body cavity around viscera contains blood is called the haemocoel.

10. Digestive tract is complete.

11. Respiration is through special structures such as Gills (e.g.-Prawn), Tracheal system (e.g.-Insects),Book lungs (e.g.-Scorpion),Book-gills (e.g.-King crabs).

12. Circulatory system is open type that is blood flows in haemocoel instead of blood vessels.

13. Nervous system comprises of Nerve ring(Brain) and a double, solid midventral nerve cord bearing a pair of ganglia per segment or less.

14. Sexes are separate, sexual dimorphism may be present.

15. Fertilization is internal but few aquatic organisms have external.

16. Mostly oviparous, few viviparous.

17. Development may be direct or indirect.

Examples;

Butterfly, Scorpion, Prawn, Spider, Cray fish, Apis(Honey Bee), Bombyx (Silk worm), Lacusta(Locust), Limulus (King crab) etc.

Answer 2

Answer:

10 features of phylum arthropoda are as follows:-

1. This is the largest phylum of animalia .
2. This phylum includes insects.
3. Over two thirds of all named species are arthropods .
4. They have organ system level of organisation.
5. They are bilaterally symmetrical.
6. They are triploblastic.
7. They are segmented and coelomate animals.
8. The body of arthropods is covered by chitinous exoskeleton.
9. The body consists of head, thorax and abdomen.
10. They have joined appendages.
11. Respiratory organs are gills , book gills , book lungs and Tracheal system.
12. Circulatory system is open type.
13. Sensory organs like antennae, eyes statocysts or balancing organs are present.
14. Excretion takes place through Malpighian tubules.
15. They are mostly dioecious.
16. Fertilisation is generally internal.
17. They are mostly oviparous.
18. Development may be direct or indirect.
19. e.g.:- Economically important insects------ Apis, Bombyx , Laccifer.
20. e.g. :- Vectors:- Anopheles, Culex and Aedes.
21. e.g.:- Gregarious pest --- Locusta ,
22. e.g.:- Living fossil------ Limulus.