A structure similar to the notochord seen in Hemichordates is known as ----.
Asomatocord
Bstomochord
Cspicocord
Dneurocord
Answer:
B. stomochord
Read Explanation:
Phylum Hemichordata:
- Hemichordata was earlier considered as a sub-phylum under phylum Chordata. But now it is placed as a separate phylum under nonchordata.
- Hemichordates have a rudimentary structure in the collar region called stomochord, a structure similar to notochord
- This phylum consists of a small group of worm-like marine animals .
- They have organ-system level of organisation
- They are bilaterally symmetrical, triploblastic and coelomates animals.
- The body is cylindrical and is composed of an anterior proboscis, a collar and a long trunk
- Circulatory system is of open type.
- Respiration takes place through gills.
- Excretory organ is proboscis gland.
- Sexes are separate.
- Fertilisation is external.
- Development is indirect.
- Examples: Balanoglossus, saccoglossus