The Question is from neet-botany biodiversity , and it was created by the author K SURESH KUMAR

Question

Which of the following combinations of characters is unique to the phylum Chordata?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Phylum Chordata characteristics
 **Related Topics**: Animal classification, invertebrate vs. vertebrate, embryonic development
 **Prerequisites**: Basic understanding of animal phyla and their defining characteristics.
## SOLUTION PATHWAY
**Given Information**:
  Four combinations of animal characteristics are provided.
  The question asks for the combination unique to Chordata.
**Method & Steps**:
 1. Analyze each option to determine if it represents characteristics found exclusively in Chordata.
  Reasoning: Chordates possess a unique combination of features during at least some stage of their development.  We need to identify the option that lists these defining features.
  Formula/Rule: N/A
 2. Evaluate each option against known Chordate characteristics.
  Working: Option A (Bilateral symmetry, triploblastic, coelomate) is found in many phyla, not just Chordata. Option C (Closed circulatory system, segmented body, jointed appendages) is found in Arthropods and other phyla. Option D (Radial symmetry, diploblastic, acoelomate) is characteristic of Cnidarians and other radially symmetric phyla. Option B (Notochord, dorsal hollow nerve cord, pharyngeal gill slits, post-anal tail) represents the four key characteristics that define the phylum Chordata, even if some are only present during embryonic development. 
  Key Point:  The presence of all four features – notochord, dorsal hollow nerve cord, pharyngeal gill slits, and post-anal tail – at some point in development is crucial for classification within Chordata.
 3. Identify the option containing the unique combination of characteristics.
  Result: Option B is the correct answer.
  Verification:  Confirm that the characteristics listed in option B are indeed unique defining features of the phylum Chordata.
 ## OPTION ANALYSIS
A :x: Bilateral symmetry, triploblastic, and coelomate are found in many phyla besides Chordata.
B ✓: Notochord, dorsal hollow nerve cord, pharyngeal gill slits, and post-anal tail are the defining characteristics of Chordata.
C :x: These characteristics are found in various phyla, not exclusively Chordata.
D :x: This describes a completely different body plan, not characteristic of Chordata.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing Chordate characteristics with those of other phyla:  Carefully review the defining features of each phylum to avoid making incorrect comparisons.
  2.Focusing only on adult features: Remember that some Chordate characteristics are only present during embryonic development.
 **Quick Tips**:
  1.Memorize the four defining characteristics of Chordata: notochord, dorsal hollow nerve cord, pharyngeal gill slits, and post-anal tail.
  2.Use a mnemonic device to remember the four characteristics of Chordata (e.g., NDPP: Notochord, Dorsal, Pharyngeal, Post-anal).

K SURESH KUMAR · Answer

Bilateral symmetry, triploblastic, coelomate

K SURESH KUMAR · Answer

The correct Option is "Notochord, dorsal hollow nerve cord, pharyngeal gill slits, post-anal tail"

K SURESH KUMAR · Answer

Closed circulatory system, segmented body, jointed appendages

K SURESH KUMAR · Answer

Radial symmetry, diploblastic, acoelomate

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