The Question is from neet-botany plant-kingdom gymnosperm, and it was created by the author B VENKAT

Question

Which feature distinguishes *Gnetum* from other gymnosperms and aligns it more closely with angiosperms?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Comparative morphology and phylogeny of gymnosperms and angiosperms
 **Related Topics**:  Vascular tissues, reproductive structures, pollination mechanisms
 **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.
  Options: Absence of archegonia, presence of vessels in xylem, naked ovules, wind pollination.
**Method & Steps**:
 1. Analyze each option's relevance to the distinction between *Gnetum* and other gymnosperms, and its similarity to angiosperms.
  Reasoning: We need to identify a characteristic unique to *Gnetum* among gymnosperms, but also present in angiosperms.
 2. Evaluate the options:
  Working:
  * **Option A (Absence of archegonia):** While some gymnosperms show reduced archegonia, this isn't unique to *Gnetum* and doesn't directly link it to angiosperms.
  * **Option B (Presence of vessels in the xylem):**  Most gymnosperms have tracheids, but *Gnetum* possesses vessels, a characteristic primarily found in angiosperms.
  * **Option C (Naked ovules):** This is a defining characteristic of gymnosperms, so it doesn't distinguish *Gnetum* or connect it to angiosperms.
  * **Option D (Wind pollination):** While *Gnetum* can be wind-pollinated, this is not unique and is found in many gymnosperms and some angiosperms.
  Key Point: The presence of vessels in the xylem is a key feature that distinguishes *Gnetum* from most other gymnosperms and aligns it more closely with angiosperms.
 3. Conclude:
  Result: The presence of vessels in the xylem (Option B) is the correct answer.
  Verification: This feature is a significant evolutionary advancement shared by *Gnetum* and angiosperms, supporting their closer phylogenetic relationship.
 ## OPTION ANALYSIS
A :x: Absence of archegonia is not unique to *Gnetum* and doesn't strongly link it to angiosperms.
B ✓: Presence of vessels in the xylem is a key distinguishing feature of *Gnetum* among gymnosperms and is common in angiosperms.
C :x: Naked ovules are characteristic of all gymnosperms and do not distinguish *Gnetum*.
D :x: Wind pollination is not unique to *Gnetum* and is found in both gymnosperms and angiosperms.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing tracheids and vessels: Remember that vessels are more efficient for water transport than tracheids.
  2.Overlooking the phylogenetic significance of vascular tissue:  The presence of vessels is a major evolutionary step.
 **Quick Tips**:
  1.Focus on features that are shared between *Gnetum* and angiosperms but absent or rare in other gymnosperms.
  2.Remember that *Gnetum*, *Ephedra*, and *Welwitschia* are often considered more advanced gymnosperms due to features they share with angiosperms.

B VENKAT · Answer

Absence of archegonia

B VENKAT · Answer

The correct Option is "Presence of vessels in the xylem"

B VENKAT · Answer

Naked ovules

B VENKAT · Answer

Wind pollination

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