write the charecteristics of phylum porifera and phylum coelentrata
Answers
Explanation:
General characteristics of Phylum Coelenterata
Kingdom: Animalia
Habitat: aquatic, mostly marine.
Habit: solitary or colonial. Each individual is known as zooid.
Symmetry: radially symmetrical
Grade of organization: tissue grade of organization.
Germ layer: diploblastic, outer ectoderm and inner endoderm. Mesogloea separates these two layer
The body has a single opening called hypostome urrounded by sensor y tentacles.
Coelom: gastrovascular cavity or coelenteron.
Nematocyst: organ for capturing and paralyzing pray, present in tentacles
Nutrition: holozoic
Digestion is both intracellular and extracellular.
Respiration and excretion are accomplished by simple diffusion.
Circulatory system: absent
Nervous system: poorly develop
Many forms exhibit polymorphism ie. Polyp and medusa
Polyps are sessile, asexual stage
Medusa are free swimming, sexual stage
Metagenesis: asexual polypoid generation alternate with sexual medusoid generation
Reproduction:
Asexual: by budding
Sexual: by gamatic fusion
Fertilization: internal or external
Development: indirect with larval stage
(Koilos: hollow, enteron: cavity)
Answer:
phylem porifera having pores on the body but colentrata having more diffentated then porifera . in colentrata having tentacles etc .