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In the sub-phylum (i) notochord is prese...

In the sub-phylum (_i_) notochord is present only in the larval tail, while in (_ii_), it extends from head to tail region and is persistent throughout their life. In (_iii_) class of vertebrate notochord is replaced by certilaginous vertebral column and (_iv_) class of vertebrate the notochord is replaced by bony vertebral column. select the option which is correct for all (i)-(iv) blanks.

A

(i) cephalochordate, (ii)-urochordata, (iii)- Agnatha, (iv)- osteichthyes

B

(i)-Protochordata, (ii)- Urochordata, (iii)-Agnatha, (iv)-osteichthyes.

C

(i)-urochordata, (ii)- cephalochordata, (iii)-chondrichthyes, (iv)- osteichthyes

D

(i)-urochordata, (ii)-cephalochordata, (iii)-agnatha, (iv)-gnathostomata.

Text Solution

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The correct Answer is:
To solve the question regarding the sub-phylum and classes of vertebrates in relation to the notochord, we will fill in the blanks step by step. ### Step-by-Step Solution: 1. **Identify the first blank (_i_):** - The question states that in this sub-phylum, the notochord is present only in the larval tail. This describes the sub-phylum **Urochordata**. Urochordates, such as tunicates, exhibit a notochord only during their larval stage, specifically in the tail region. **Answer for (_i_): Urochordata** 2. **Identify the second blank (_ii_):** - The question mentions that in this sub-phylum, the notochord extends from the head to the tail region and is persistent throughout their life. This corresponds to the sub-phylum **Cephalochordata**. Members of this group, like lancelets, retain the notochord throughout their life. **Answer for (_ii_): Cephalochordata** 3. **Identify the third blank (_iii_):** - The question states that in this class of vertebrates, the notochord is replaced by a cartilaginous vertebral column. This is characteristic of the class **Chondrichthyes**, which includes cartilaginous fishes such as sharks and rays. **Answer for (_iii_): Chondrichthyes** 4. **Identify the fourth blank (_iv_):** - The question indicates that in this class of vertebrates, the notochord is replaced by a bony vertebral column. This is true for the class **Osteichthyes**, which encompasses bony fishes. **Answer for (_iv_): Osteichthyes** ### Final Answers: - (_i_): Urochordata - (_ii_): Cephalochordata - (_iii_): Chondrichthyes - (_iv_): Osteichthyes
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