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The following are the statements about non-chordates: (NEET 2024)
A. Pharynx is perforated by gill slits.
B. Notochord is absent.
C. Central nervous system is dorsal.
D. Heart is dorsal if present.
E. Post anal tail is absent.Choose the most appropriate answer from the options given below:
B. Notochord is absent.
C. Central nervous system is dorsal.
D. Heart is dorsal if present.
E. Post anal tail is absent.Choose the most appropriate answer from the options given below:
- a)A & C only
- b)A, B & D only
- c)B, D & E only
- d)B, C & D only
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The following are the statements about non-chordates: (NEET 2024)A. ...
Overview of Non-Chordates
Non-chordates are a diverse group of animals that lack key characteristics found in chordates. The statements provided can be evaluated based on the anatomical features of non-chordates.
Analysis of Each Statement
- A. Pharynx is perforated by gill slits.
This statement is typically true for chordates, especially in their larval stages (like in some tunicates and lancelets), but it is not a common feature of non-chordates.
- B. Notochord is absent.
This statement is correct. Non-chordates do not possess a notochord, which is a defining feature of chordates.
- C. Central nervous system is dorsal.
This statement is also correct for chordates. Non-chordates generally have a ventral nervous system or a nerve net in simpler forms.
- D. Heart is dorsal if present.
This statement is true for some chordates, but it does not apply to most non-chordates, as their circulatory systems vary widely.
- E. Post-anal tail is absent.
This statement is true for non-chordates. Many non-chordates do not have a post-anal tail, which is a characteristic feature of chordates.
Correct Answer Explanation
The correct answer is option C (B, D & E only) because:
- B (Notochord absent) and E (Post-anal tail absent) are true statements about non-chordates.
- D (Heart is dorsal if present) is misleading as it does not apply uniformly to non-chordates.
Thus, while B and E are accurate, D can also be misleading in interpretation, which leads to some confusion.
In summary, option C highlights the absence of the notochord, presence of a diverse circulatory system, and absence of a post-anal tail in non-chordates.
Non-chordates are a diverse group of animals that lack key characteristics found in chordates. The statements provided can be evaluated based on the anatomical features of non-chordates.
Analysis of Each Statement
- A. Pharynx is perforated by gill slits.
This statement is typically true for chordates, especially in their larval stages (like in some tunicates and lancelets), but it is not a common feature of non-chordates.
- B. Notochord is absent.
This statement is correct. Non-chordates do not possess a notochord, which is a defining feature of chordates.
- C. Central nervous system is dorsal.
This statement is also correct for chordates. Non-chordates generally have a ventral nervous system or a nerve net in simpler forms.
- D. Heart is dorsal if present.
This statement is true for some chordates, but it does not apply to most non-chordates, as their circulatory systems vary widely.
- E. Post-anal tail is absent.
This statement is true for non-chordates. Many non-chordates do not have a post-anal tail, which is a characteristic feature of chordates.
Correct Answer Explanation
The correct answer is option C (B, D & E only) because:
- B (Notochord absent) and E (Post-anal tail absent) are true statements about non-chordates.
- D (Heart is dorsal if present) is misleading as it does not apply uniformly to non-chordates.
Thus, while B and E are accurate, D can also be misleading in interpretation, which leads to some confusion.
In summary, option C highlights the absence of the notochord, presence of a diverse circulatory system, and absence of a post-anal tail in non-chordates.
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Community Answer
The following are the statements about non-chordates: (NEET 2024)A. ...
The correct answer is Option C: B, D & E only. Here's why:
B. Notochord is absent: This is the defining characteristic of non-chordates. Chordates possess a notochord at some stage of their development, while non-chordates do not.
D. Heart is dorsal if present: In non-chordates with a circulatory system, the heart is located on the dorsal (back) side of the body, unlike chordates where it's ventral (front).
E. Post anal tail is absent: Non-chordates lack a post-anal tail, a feature present in chordates.
D. Heart is dorsal if present: In non-chordates with a circulatory system, the heart is located on the dorsal (back) side of the body, unlike chordates where it's ventral (front).
E. Post anal tail is absent: Non-chordates lack a post-anal tail, a feature present in chordates.
Why the other options are incorrect:
A. Pharynx is perforated by gill slits: This is a characteristic of chordates, particularly in aquatic forms for respiration.
C. Central nervous system is dorsal: While this is true for chordates, non-chordates have a ventral nerve cord.
C. Central nervous system is dorsal: While this is true for chordates, non-chordates have a ventral nerve cord.
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