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In vertebrates the notochord :-...

In vertebrates the notochord :-

A

Persists throughout the life

B

Is partially replaced by vertebral column

C

Is completely replaced by vertebral column

D

Is partially or fully replaced by vertebral column

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Notochord**: The notochord is a flexible rod-like structure that provides support and is present in the embryonic stage of vertebrates. It is crucial for the development of the vertebrate body plan. 2. **Analyzing the Options**: - **Option 1**: "Persists throughout the life" - This is incorrect because the notochord does not persist in adult vertebrates; it is only present during the embryonic stage. - **Option 2**: "Partially replaced by the vertebral column" - This option is also incorrect as the notochord is not just partially replaced; it is completely replaced. - **Option 3**: "Completely replaced by the vertebral column" - This option is misleading. While the notochord is replaced by the vertebral column, it is not accurate to say it is completely replaced in all vertebrates, as some may retain remnants of the notochord. - **Option 4**: "Partially or fully replaced by the vertebral column" - This is the most accurate option. In adult vertebrates, the vertebral column does replace the notochord, but some remnants may remain in certain species. 3. **Conclusion**: The correct answer is **Option 4**: "Partially or fully replaced by the vertebral column." This option accurately reflects the relationship between the notochord and the vertebral column in vertebrates. ---
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Select the option with a correct representation of an animal belonging to the below mentioned class of vertebrates. I. The notochord is persisitent throughout life. The mouth is ventral. II. The skin is moist without scales . The tail may be present. III. 6 to 15 pairs of gill slits. Jaws absent. IV. Viviparous usually. pinna present in most of the members.

Notochord is

Notochord is

Notochord is