The Question is from neet-zoology animal-kingdom classification-of-animals, and it was created by the author K SUNKANNA

Question

Which of the following combinations of characteristics is NOT found in any extant chordate lineage?

K SUNKANNA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Chordate characteristics
 **Related Topics**: Animal phylogeny, circulatory systems, body symmetry, skeletal systems
 **Prerequisites**: Basic understanding of chordate anatomy and evolutionary relationships.
## SOLUTION PATHWAY
**Given Information**:
  Four combinations of characteristics: circulatory system type, symmetry, and endoskeleton type.
  Task: Identify the combination not present in any extant chordate lineage.
**Method & Steps**:
 1. Analyze each option for consistency with known chordate characteristics.
  Reasoning: Chordates are characterized by a closed circulatory system, bilateral symmetry, and a flexible rod called a notochord (which may be replaced by a cartilaginous or bony vertebral column in many lineages).
 2. Evaluate each option against the chordate characteristics.
  Working:
  * Option A: Open circulatory system, radial symmetry, and cartilaginous endoskeleton.  Radial symmetry is not found in chordates. Open circulatory systems are found in some invertebrates but not chordates.
  * Option B: Closed circulatory system, bilateral symmetry, and bony endoskeleton. This is found in many chordate lineages (e.g., bony fishes, tetrapods).
  * Option C: Closed circulatory system, bilateral symmetry, and cartilaginous endoskeleton. This is found in some chordate lineages (e.g., cartilaginous fishes).
  * Option D: Closed circulatory system, bilateral symmetry, and no endoskeleton.  While some larval chordates lack a well-developed endoskeleton, adult forms generally possess some form of skeletal support (notochord or vertebral column).
 3. Identify the combination that contradicts chordate characteristics.
  Result: Option A is the only combination that includes characteristics (radial symmetry and open circulatory system) not found in any extant chordate lineage.
  Verification:  Confirm that the other options are representative of existing chordate groups.
 ## OPTION ANALYSIS
A ✓: Open circulatory system, radial symmetry, and cartilaginous endoskeleton. This combination is incorrect because chordates have closed circulatory systems and bilateral symmetry. Radial symmetry is a characteristic of organisms like cnidarians, not chordates.
B :x: Closed circulatory system, bilateral symmetry, and bony endoskeleton. This is characteristic of many bony vertebrates (e.g., mammals, birds, reptiles).
C :x: Closed circulatory system, bilateral symmetry, and cartilaginous endoskeleton. This is characteristic of cartilaginous fishes (e.g., sharks, rays).
D :x: Closed circulatory system, bilateral symmetry, and no endoskeleton.  While some larval forms may lack a fully developed endoskeleton, adult chordates possess some form of skeletal support.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing chordate characteristics with those of other animal phyla:  Carefully consider the defining features of chordates to avoid selecting options that describe other groups.
  2.Overlooking the range of variation within chordates: While there is a basic chordate body plan, there is significant diversity in skeletal structure and other features among different lineages.
 **Quick Tips**:
  1.Memorize the key defining characteristics of chordates (notochord, dorsal hollow nerve cord, pharyngeal slits, post-anal tail).
  2.Focus on the unique combinations of characteristics to eliminate incorrect options quickly.

K SUNKANNA · Answer

The correct Option is "Open circulatory system, radial symmetry, and cartilaginous endoskeleton"

K SUNKANNA · Answer

Closed circulatory system, bilateral symmetry, and bony endoskeleton

K SUNKANNA · Answer

Closed circulatory system, bilateral symmetry, and cartilaginous endoskeleton

K SUNKANNA · Answer

Closed circulatory system, bilateral symmetry, and no endoskeleton

NEET Zoology Animal Kingdom Classification Of Animals MCQs

Select Topic

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

NEET Subjects

Our Bots

Company