write any 7 important points of phylum:Aschelminthes briefly
Answers
Answer:
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Explanation:
Their body is bilaterally symmetrical and triploblastic.
They are cylindrical in shape.
They exhibit tissue level organization.
Their body has a cavity or pseudocoelom.
The alimentary canal is distinct, with the mouth and the anus.
They are sexually dimorphic.
They are devoid of the circulatory system and respiratory system.
Characteristics of phylum-Nemathelminthes :
(a) They are free living aquatic (marine and fresh water), terrestrial or parasitic in plants and animals.
(b) They are triploblastic bilaterally symmetrical, unsegmented, cylindrical or flattened worms with organ system level of body organization.
(c) Pseudocoelom cavity is found between body wall and the digestive tract.
(d) The skin is covered by tough resistant cuticle. It is followed by syncytial (multinucleated) epidermis and muscle layer.
(e) The digestive canal is straight or slightly curved starting from mouth and ending by anus.
(f) No respiratory or blood vascular system.
(g) Excretion occurs from the body cavity through excretory pores.
(h) Mostly unisexual (dioecious) and fertilization is internal Development may be direct or indirect.
Examples: Ascaris (Round-worm), Wuchereria (filaria worm), Ancylostoma (hook worm). eel worm.
