The Question is from neet-zoology animal-kingdom , and it was created by the author T HARITHA

Question

Which of these features is NOT characteristic of the class Hexactinellida?

T HARITHA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Characteristics of Hexactinellida (glass sponges)
 **Related Topics**: Porifera classification, sponge morphology, habitat preferences
 **Prerequisites**: Basic understanding of sponge anatomy and classification.
## SOLUTION PATHWAY
**Given Information**:
  The question asks to identify a feature NOT characteristic of Hexactinellida.
  Options describe various features of sponges.
**Method & Steps**:
 1. Analyze each option to determine if it accurately describes Hexactinellida.
  Reasoning: We need to evaluate the typical characteristics of glass sponges (Hexactinellida) to identify the incorrect statement.
  Formula/Rule: N/A
 2. Identify the option that is inconsistent with the known characteristics of Hexactinellida.
  Working: Let's examine each option:
  A. Six-rayed siliceous spicules: This is a defining characteristic of Hexactinellida.
  B. Syncytial body structure with trabecular reticulum:  This is a unique structural feature of Hexactinellida.
  C. Predominantly found in shallow, warm waters: This is incorrect. Hexactinellida are typically found in deep, cold waters.
  D. Often exhibit radial symmetry: This is a common characteristic of Hexactinellida.
 3. Conclude which option is not a characteristic.
  Result: Option C is the correct answer because Hexactinellida are predominantly found in deep, cold waters, not shallow, warm waters.
  Verification:  The other options are all well-established characteristics of the Hexactinellida class.
 ## OPTION ANALYSIS
A ✓: Six-rayed siliceous spicules are the defining characteristic of Hexactinellida.
B :x:  The syncytial body structure with a trabecular reticulum is a key feature of Hexactinellida.
C :x: Hexactinellida are typically found in deep, cold waters, not shallow, warm waters. This is the incorrect statement.
D :x: Many Hexactinellida exhibit radial symmetry.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing Hexactinellida with other sponge classes:  Carefully review the distinct characteristics of each sponge class to avoid errors.
  2.Overlooking the habitat preference: Remember that Hexactinellida prefer deep, cold waters.
 **Quick Tips**:
  1.Focus on the unique characteristics of Hexactinellida (six-rayed spicules, syncytial structure, deep-sea habitat).
  2.Use mnemonic devices to remember the key features of different sponge classes.

T HARITHA · Answer

Six-rayed siliceous spicules

T HARITHA · Answer

Syncytial body structure with trabecular reticulum

T HARITHA · Answer

The correct Option is "Predominantly found in shallow, warm waters"

T HARITHA · Answer

Often exhibit radial symmetry

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