Question

Which group is commonly called as 'sea stick'
A) Arthropoda
B) Echinodermata
C) Coelenterata
D) Porifera

Answer 1

arthropoda is the answer

Answer 2

Answer:

C) Coelenterata is the right answer, as it is commonly known as 'sea stick'.

Explanation:

• Coelenterata is commonly known as 'sea stick'.
• Entities of the phylum Coelenterata are usually found attached to rocks on the seafloor.
• Coelenterates are multicellular entities that may be present alone or in colonies and represent the simplest group of invertebrates.
• The mouth of such creatures is surrounded by short, thin tentacles.  
• These aquatic organisms have a radially symmetrical body structure, are ectodermal, and lack body cavities.
• Their bodies have hypostome-a single opening surrounded by sensory tentacles that are fed with coloblasts or nematocysts  to capture floating prey.
• The tentacles are surrounded by a gastrovascular cavity or coelenteron, which is a spacious cavity.
• Coelenterate digestion occurs both extracellularly and intracellularly, but simple diffusion is the means by which excretion and respiration are achieved.