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

Question

The life cycles of *Ectocarpus* and *Fucus* are respectively:

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Life cycles in brown algae (Phaeophyceae)
 **Related Topics**: Haplontic, diplontic, haplodiplontic life cycles; alternation of generations; sporophyte; gametophyte
 **Prerequisites**: Understanding of basic life cycle types and terminology in algae.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the life cycles of *Ectocarpus* and *Fucus*.
  *Ectocarpus* exhibits a haplodiplontic life cycle, meaning it has both a multicellular haploid and a multicellular diploid phase. 
  *Fucus* exhibits a diplontic life cycle, meaning the diploid phase is dominant, and the haploid phase is reduced to gametes.
**Method & Steps**:
 1. Identify the life cycle type of *Ectocarpus*:
  Reasoning: *Ectocarpus* shows an alternation of generations with both free-living sporophytes and gametophytes.
  Formula/Rule: None
 2. Identify the life cycle type of *Fucus*:
  Working: *Fucus* has a dominant diploid sporophyte and a significantly reduced, microscopic gametophyte.
  Key Point: The gametophyte in *Fucus* is not free-living and is only represented by the gametes.
 3. Combine the life cycle types:
  Result: *Ectocarpus* is haplodiplontic, and *Fucus* is diplontic.
  Verification: This aligns with the established knowledge of these species' life cycles.
 ## OPTION ANALYSIS
A ✓: Haplodiplontic and diplontic - Correctly identifies the life cycles of *Ectocarpus* and *Fucus*, respectively.
B :x: Diplontic and haplodiplontic - Reverses the life cycle types.
C :x: Haplontic and diplontic - Incorrectly identifies *Ectocarpus* as haplontic (only haploid phase dominant).
D :x: Diplontic and haplontic - Incorrectly identifies both life cycles.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing haplodiplontic and diplontic life cycles: Focus on the dominance of haploid vs. diploid phases.
  2.Misidentifying the dominant phase in each alga: Carefully examine the characteristics of each species' life cycle.
 **Quick Tips**:
  1.Remember *Ectocarpus* has a clear alternation of generations.
  2.Recall that *Fucus* has a reduced gametophyte.

B VENKAT · Answer

The correct Option is "Haplodiplontic and diplontic"

B VENKAT · Answer

Diplontic and haplodiplontic

B VENKAT · Answer

Haplontic and diplontic

B VENKAT · Answer

Diplontic and haplontic

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