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

Question

I. Chromosomes cluster at opposite spindle poles their identity is lost as discrete elements
II. Nuclear envelope assembles around the chromosome clusters
III. Nucleolus, Golgi complex and ER reform
Above features indicates which phase of mitosis

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
**Primary Concept**: Mitosis Phases
**Related Topics**: Cell Cycle, Chromosome Structure, Nuclear Envelope, Organelle Function
**Prerequisites**: Knowledge of the different stages of mitosis (prophase, metaphase, anaphase, telophase), and the general function of cellular organelles.
## SOLUTION PATHWAY
**Given Information**:
    *   Chromosomes clustering at opposite poles.
    *   Loss of discrete chromosome identity.
    *   Nuclear envelope reformation.
    *   Reformation of nucleolus, Golgi complex, and ER.

**Method & Steps**:
1. **Review Mitotic Phases**: Recall the key events of each phase of mitosis.
   Reasoning: Each phase of mitosis has distinct characteristics. Telophase is characterized by the reversal of events of prophase and prometaphase.
   Formula/Rule: None
2. **Analyze Statements**: Evaluate each statement to identify the phase of mitosis it describes.
    Working: Statement I refers to the separation of chromatids and their arrival at the poles, but in early anaphase the chromatids are still discrete elements, and they lose this identity in telophase. Statement II indicates the reformation of the nuclear envelope, which is a telophase event. Statement III refers to the reformation of organelles which occurs in telophase.
     Key Point: The loss of discrete chromosome identity, and the reassembly of the nuclear envelope and organelles is a key feature of telophase.
3. **Identify the Correct Phase**: Conclude the phase based on the analysis.
    Result: Telophase is the correct phase.
    Verification: The listed events are characteristic of telophase.
 ## OPTION ANALYSIS
[A] :x: Anaphase is characterized by the separation of sister chromatids and their movement to opposite poles, but the chromosomes are still discrete elements, and the nuclear envelope does not reassemble in this phase.
[B] ✓: Telophase is marked by the arrival of chromosomes at the poles, their decondensation, the reformation of the nuclear envelope, and the reappearance of the nucleolus and other organelles.
[C] :x: Cytokinesis is the division of the cytoplasm, which occurs after telophase. The nuclear and organelle changes mentioned are not features of cytokinesis.
[D] :x: S-phase is the phase of DNA replication, which is an interphase event, and not part of mitosis.
## LEARNING AIDS
**Common Mistakes**:
    1. Confusing Anaphase and Telophase: Anaphase involves separation of sister chromatids, while telophase involves reformation of nuclear envelope and organelles.
    2. Misunderstanding S-Phase: S-phase is a replication phase, not a mitotic phase.
**Quick Tips**:
    1. Use mnemonic devices to remember the order of mitotic phases (PMAT).
    2. Focus on the key events that define each phase, such as chromosome behavior and nuclear envelope dynamics.

Mr. NARESH KUMAR K · Answer

Anaphase

Mr. NARESH KUMAR K · Answer

The correct Option is "Telophase"

Mr. NARESH KUMAR K · Answer

Cytokinesis

Mr. NARESH KUMAR K · Answer

S-phase

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