One character is given wrongly for Phylum Chordata. Mark ita)Presence...
Incorrect Character for Phylum Chordata:
Phylum Chordata is characterized by several key features, one of which is the presence of a vertebral column. However, in the given options, the character "b) Presence of vertebral column" is incorrect.
Explanation:
a) Presence of notochord:
- Chordates have a notochord, which is a flexible rod-like structure that provides support along the length of the body. This structure is present in all chordates at some stage of their development.
b) Presence of vertebral column:
- While vertebrates, a subphylum of chordates, have a vertebral column, not all chordates possess this feature. In fact, only the subphylum Vertebrata within Chordata has a true vertebral column made up of individual vertebrae.
c) Paired gill slits connected with the exterior:
- Chordates also have paired gill slits that are connected to the exterior environment. These structures are involved in respiration and are a common feature in chordates.
d) A central nervous system dorsal to the digestive canal:
- Another characteristic of chordates is the presence of a central nervous system that is located dorsal to the digestive canal. This arrangement is seen in all chordates, from simple organisms like lancelets to more complex vertebrates.
Therefore, the correct character for Phylum Chordata is the presence of a notochord, paired gill slits connected with the exterior, and a central nervous system dorsal to the digestive canal, while the presence of a vertebral column is specific to the subphylum Vertebrata within Chordata.
One character is given wrongly for Phylum Chordata. Mark ita)Presence...
Vertebral column is present in the vertebrates only. It is not present in all the chordates. Cephalochordata (lancelets), Urochordata (Tunicates), and Myxine (hagfishes) These groups are the chordates which do not possess vertebrae. Many are hermaphroditic, sessile or buried within the sand of aquatic environments, and hatch from eggs within the parent's body.
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