any 7 important points of phylum platyhelminthes briefly
Answers
Answer:
✌️I HAVE WRITTEN 10 POINTS ON PHYLUM PLATYHELMINTHES U CAN WRITE THOSE, WHICH ONE U FELL EZY.✌️
❤️phylum platyhelminthes❤️
➡️Their body is dorsoventrally flattened.They exhibit bilateral symmetry.
➡️Also, they are triploblastic, with three germ layers.
➡️They do not have a body cavity and are acoelomate.The body is soft and unsegmented.
➡️They are mostly parasitic with a few free-living.They exhibit an organ system grade of organization.
➡️The digestive system is incomplete or absent.Respiratory and circulatory systems are absent.
➡️The flame cells help in excretion. The excretory system has protonephridia with the flame.
➡️A primitive nervous system is present.
➡️Sexual reproduction happens through gametic fusion.Asexual reproduction also happens in a few species through regeneration and fission.
➡️Fertilization is internal.
➡️The life cycle of these organisms can be complex, especially if they are parasitic, as this may involve one or more host animals.
Explanation:
HOPE IT HELPS YOU DEAR.....❤️
...........STAY BLESSED..........
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.