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

Question

Which of the following algae exhibits haplontic life cycle?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Life cycles in algae
 **Related Topics**: Haplontic, diplontic, haplodiplontic life cycles; Algae classification
 **Prerequisites**: Understanding of basic cell biology, meiosis, mitosis, and alternation of generations.
## SOLUTION PATHWAY
**Given Information**:
The question asks to identify the alga with a haplontic life cycle.
**Method & Steps**:
1. **Understanding Life Cycles:** Algae exhibit different types of life cycles: haplontic, diplontic, and haplodiplontic.  A haplontic life cycle is characterized by the dominant haploid phase, with the diploid zygote undergoing meiosis immediately after formation.
2. **Analyzing Options:**
    * **Fucus:** Exhibits a diplontic life cycle (dominant diploid phase).
    * **Ectocarpus:** Exhibits a haplodiplontic life cycle (both haploid and diploid phases are multicellular and independent).
    * **Polysiphonia:** Exhibits a haplodiplontic life cycle (both haploid and diploid phases are multicellular and independent).
    * **Spirogyra:** Exhibits a haplontic life cycle. The haploid phase is dominant, and the diploid zygote undergoes meiosis immediately after formation.
3. **Final Step:**
  **Result:** Spirogyra is the correct answer because it displays a haplontic life cycle.
  **Verification:** The characteristics of Spirogyra's life cycle match the definition of a haplontic life cycle.
 ## OPTION ANALYSIS
A :x: Fucus has a diplontic life cycle.
B :x: Ectocarpus has a haplodiplontic life cycle.
C :x: Polysiphonia has a haplodiplontic life cycle.
D ✓: Spirogyra has a haplontic life cycle, where the haploid phase is dominant and the diploid phase is only the zygote.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing haplontic, diplontic, and haplodiplontic life cycles:  Carefully review the definitions and dominant phases for each type.
  2.Incorrectly associating algae with specific life cycles:  Learn the life cycle characteristics of common algal genera.
 **Quick Tips**:
  1.Remember the dominant phase in each type of life cycle: Haplontic (haploid), Diplontic (diploid), Haplodiplontic (both haploid and diploid).
  2.Create a table summarizing the life cycle types and examples of algae exhibiting each type.

Mr. NARESH KUMAR K · Answer

Fucus

Mr. NARESH KUMAR K · Answer

Ectocarpus

Mr. NARESH KUMAR K · Answer

Polysiphonia

Mr. NARESH KUMAR K · Answer

The correct Option is "Spirogyra"

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