8. Write the characters of the following
phylum. a) Vertebrates c) Porifera b)
Arthropoda d) Echinodermata
Answers
Answer:
See Explanation
Explanation:
a) Vertebrates:
These animals have truly vertebral column and internal skeleton. They are bilaterally symmetrical, triploblastic, coelomatic, segmented. They are grouped into 5 classes
b) Porifera:
They are generally marine aquatic organisms, with a few freshwater species. Their bodies are asymmetrical. Body shape can be cylindrical, vase-like, rounded or sac-like. They are diploblastic animals with two layers, the outer dermal layer and the inner gastral layer.
c) arthropoda:
They possess an exoskeleton. They have jointed appendages. Their body is segmented. They are bilaterally symmetrical. They possess an open circulatory system.
d) echinodermata:
They possess an exoskeleton. They have jointed appendages. Their body is segmented. They are bilaterally symmetrical. They possess an open circulatory system.
thank you....
Please mark me as brainliest...
Vertebrates
◈ All vertebrates are bilaterally symmetrical, segmented and triploblastic.
◈ Paired appendages are present which may be fins or limbs.
◈ Closed circulatory system is present : ventral, muscular heart with 2, 3 or 4 chamber.
◈ A pair of Kidneys are present for excretion and osmoregulation.
◈ Body divided into head, neck, trunk and tail. some notable exceptions are there like fishes lack neck, Amphibians lack both neck and tail.
◈ Example : Fishes, tiger, lion, Salamander, Rana, frog etc.
Porifera
◈ Perifera includes lowest of multicellular animals commonly called sponges.
◈ They are primitive organisms with cellular level of organization.
◈ All sponges are aquatic mostly marine, few are freshwater.
◈ They are mostly asymmetrical animals.
◈ They have a water transport system.
◈ They reproduce sexually by formation of gametes and asexually by budding or fragmentation.
◈ Example : Spongilla, Euspongia and sycon.
Arthropoda
◈ They are largest phylum of animal kingdom.
◈ They are Triploblastic, bilaterally symmetrical and metamerically segmented.
◈ Circulatory system is open type with a dorsal heart, arteries and blood sinuses.
◈ Body is divisible into head, throx and abdomen.
◈ Muscles are mostly striated and digestive system is complete.
◈ Sexual dimorphism is exhibited. Fertilization is usually Internal.
◈ Example : Apis, Aedes, Locusts, Butterfly, scorpions,. etc
Echinodermata
◈ All are marine with Organ system level of organization.
◈ They are spiny skinned unsegmented animals.
◈ The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical.
◈ Digestive system is complete with mouth on the ventral side and anus on the dorsal side.
◈ Excretory system is absent.
◈ Reproduction is sexual. Sexes are separate. Fertilization is external.
◈ Example : Star fish, Sea urchins, Sea cucumber and Ophiura.