Experts please answer
5. Give the chracteristic features of the following
a) Urochordata
b) Cephalochordata
c) Chondrichthyes
d) Ostichthyes
Dear student,
Please find below the solutions:
a) Distinguishing features of urochordates-
1.Marine invertebrate.
2.Sac-like unsegmented body.
3.Adult animal do not have notochord, nerve cord or tail.
4.They possess tubular openings known as siphons which are used to filter the water.
5.They occur in colonies known as zooids.
b) Distinguishing features of cephalochordates-
1.Presence of notochord that persists throughout the life.
2.The presence of pharyngeal gill slits
3.Presence of post-anal tail.
4.Brain is small and poorly developed.
5.No true vertebrae.
Pisces can be divided into two classes – Class Chondrichthyes (cartilaginous fish) and Class Osteichthyes (bony fishes).
c) Distinguishing features of Class Chondrichthyes –
d) Distinguishing features of Class Osteichthyes
Regards
Please find below the solutions:
a) Distinguishing features of urochordates-
1.Marine invertebrate.
2.Sac-like unsegmented body.
3.Adult animal do not have notochord, nerve cord or tail.
4.They possess tubular openings known as siphons which are used to filter the water.
5.They occur in colonies known as zooids.
b) Distinguishing features of cephalochordates-
1.Presence of notochord that persists throughout the life.
2.The presence of pharyngeal gill slits
3.Presence of post-anal tail.
4.Brain is small and poorly developed.
5.No true vertebrae.
Pisces can be divided into two classes – Class Chondrichthyes (cartilaginous fish) and Class Osteichthyes (bony fishes).
c) Distinguishing features of Class Chondrichthyes –
- skins are covered with placoid scales
- skeleton is cartilaginous
- tail fins are asymmetrical
- fertilization is internal
- cold blooded
- no external ears
- operculum over gills are absent.
d) Distinguishing features of Class Osteichthyes
- Skins are covered with cycloid scales
- Skeleton is bony
- Tail fins are symmetrical
- Operculum is present
- No external ears
- Cold blooded
- Fertilization is external.
Regards