The Question is from neet-botany plant-kingdom gymnosperms, and it was created by the author Mr. NARESH KUMAR K

Question

Which feature distinguishes *Gnetum* from other gymnosperms and brings it closer to angiosperms?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Comparative anatomy of gymnosperms and angiosperms
 **Related Topics**:  Vascular tissue, reproduction in gymnosperms, evolutionary relationships in plants
 **Prerequisites**: Basic understanding of plant anatomy, gymnosperm and angiosperm characteristics.
## SOLUTION PATHWAY
**Given Information**:
  The question asks for a feature that sets *Gnetum* apart from other gymnosperms and makes it resemble angiosperms.
**Method & Steps**:
 1. Analyze the options to determine which feature is unique to *Gnetum* among gymnosperms and shared with angiosperms.
  Reasoning: We need to identify a characteristic present in *Gnetum* and angiosperms but absent in most other gymnosperms.
 2. Evaluate each option:
  Option A: Archegonia are absent in some gymnosperms, not just *Gnetum*.  This isn't a unique feature distinguishing it from other gymnosperms and making it closer to angiosperms.
  Option B: Vessel elements in the xylem are a characteristic of angiosperms.  The presence of vessel elements in *Gnetum*'s xylem is a significant feature that differentiates it from most other gymnosperms which typically have only tracheids.
  Option C: Non-motile male gametes are found in many gymnosperms, including *Gnetum*. This is not a distinguishing feature.
  Option D: Needle-like leaves are characteristic of some, but not all, gymnosperms.  *Gnetum* has broad leaves, but this is not a feature shared with angiosperms, nor is it unique to *Gnetum* among gymnosperms.
 3. Conclusion:
  Result: The presence of vessel elements in the xylem (Option B) is the feature that distinguishes *Gnetum* from most other gymnosperms and aligns it more closely with angiosperms.
  Verification: The presence of vessel elements is a key characteristic of efficient water transport in angiosperms, a feature that *Gnetum* shares, unlike most other gymnosperms.
 ## OPTION ANALYSIS
A :x: Absence of archegonia is not unique to *Gnetum* among gymnosperms.
B ✓: Presence of vessel elements in xylem is a key feature of angiosperms and is present in *Gnetum*, setting it apart from most other gymnosperms.
C :x: Non-motile male gametes are not unique to *Gnetum*.
D :x:  Needle-like leaves are not a defining characteristic of *Gnetum* or a feature shared with angiosperms.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing features of some gymnosperms with features unique to *Gnetum* : Carefully consider which features are widespread among gymnosperms and which are unique to *Gnetum*.
  2.Overlooking the evolutionary significance of vessel elements:  Understanding the importance of vessel elements in water transport efficiency is crucial for answering this question.
 **Quick Tips**:
  1.Focus on features related to vascular tissue and reproductive structures when comparing gymnosperms and angiosperms.
  2.Remember that *Gnetum* represents a lineage of gymnosperms with traits that bridge the gap between gymnosperms and angiosperms.

Mr. NARESH KUMAR K · Answer

Absence of archegonia

Mr. NARESH KUMAR K · Answer

The correct Option is "Presence of vessel elements in the xylem"

Mr. NARESH KUMAR K · Answer

Non-motile male gametes

Mr. NARESH KUMAR K · Answer

Needle-like leaves

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