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

Question

Which of the following statements regarding the development of the male gametophyte in *Pinus* is INCORRECT?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Development of male gametophyte in *Pinus*
 **Related Topics**: Gymnosperms, Microsporogenesis, Male gamete formation
 **Prerequisites**: Basic understanding of plant reproduction and cell division.
## SOLUTION PATHWAY
**Given Information**:
Four statements regarding the development of the male gametophyte in *Pinus* are provided.
**Method & Steps**:
1. Analyze each statement individually to determine its accuracy.
2. Identify the statement that is inconsistent with the known developmental process of the male gametophyte in *Pinus*.

**Statement A:** Microspore is the first cell of the male gametophyte.  This is correct. The microspore undergoes mitosis to develop into the male gametophyte.

**Statement B:** The prothallial cell eventually degenerates. This is correct. The prothallial cell is a vestigial structure and degenerates during further development.

**Statement C:** The generative cell directly develops into the sterile cell and two male gametes. This is incorrect. The generative cell undergoes mitosis to produce two male gametes. There is no sterile cell directly formed from the generative cell in this process.

**Statement D:** A tube cell and a generative cell are formed after the first mitotic division of the microspore. This is correct. The first division of the microspore results in a larger tube cell and a smaller generative cell.

3. Conclusion: Statement C is the incorrect statement.

Result: C
  Verification:  The development of the male gametophyte in *Pinus* follows a specific pattern, and statement C contradicts this established pattern.
 ## OPTION ANALYSIS
A ✓: Correctly describes the microspore as the initial cell of the male gametophyte.
B ✓: Accurately states that the prothallial cell degenerates.
C :x: Incorrectly describes the generative cell's development; it doesn't directly form a sterile cell and two gametes.  It divides mitotically to produce two sperm cells.
D ✓: Correctly explains the outcome of the first mitotic division of the microspore.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the role of the generative cell: Students might incorrectly assume the generative cell directly forms gametes without mitosis.
  How to avoid: Carefully study the sequence of events in microgametogenesis. 
  2.Overlooking the fate of the prothallial cell: Students might forget that this cell is a transient structure.
  How to avoid: Pay attention to the details of each stage of development.
 **Quick Tips**:
  1.Remember the key developmental stages: Microspore → Tube cell + Generative cell → Tube cell + 2 sperm cells
  2.Visual aids like diagrams are crucial for understanding this developmental process.

Mr. NARESH KUMAR K · Answer

Microspore is the first cell of the male gametophyte.

Mr. NARESH KUMAR K · Answer

The prothallial cell eventually degenerates.

Mr. NARESH KUMAR K · Answer

The correct Option is "The generative cell directly develops into the sterile cell and two male gametes."

Mr. NARESH KUMAR K · Answer

A tube cell and a generative cell are formed after the first mitotic division of the microspore.

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