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

Question

The dominant phase in the life cycle of a pteridophyte is the:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Alternation of generations in pteridophytes
 **Related Topics**: Gametophyte, Sporophyte, Spores, Life cycle of ferns
 **Prerequisites**: Basic understanding of plant life cycles and terminology.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the dominant phase in the life cycle of a pteridophyte (a fern).
  Pteridophytes exhibit an alternation of generations.
**Method & Steps**:
 1. Identify the two main phases in the alternation of generations: the gametophyte (haploid, produces gametes) and the sporophyte (diploid, produces spores).
  Reasoning:  Pteridophytes, unlike bryophytes, have a dominant sporophyte generation.
  Formula/Rule: N/A
 2. Determine which phase is larger, longer-lived, and more independent in pteridophytes.
  Working: The sporophyte is the dominant phase in pteridophytes. It is the larger, more conspicuous, and longer-lived phase. The gametophyte (prothallus) is small and relatively short-lived.
  Key Point: The sporophyte is photosynthetically independent and produces spores by meiosis.
 3. Select the correct option.
  Result: The sporophyte is the dominant phase.
  Verification: This is a well-established fact in botany.
 ## OPTION ANALYSIS
A :x: Gametophyte is the smaller, less conspicuous, and shorter-lived phase in pteridophytes.
B ✓: Sporophyte is the larger, more conspicuous, and longer-lived phase in pteridophytes.
C :x: Prothallus is another name for the gametophyte, which is not the dominant phase.
D :x: Zygote is a single diploid cell formed after fertilization; it is not a phase of the life cycle.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the dominant phase with the phase that produces gametes:  Students may mistakenly choose gametophyte because they focus on the reproductive aspect.
  [How to avoid]: Remember that dominance refers to size, longevity, and independence, not just reproductive function.
  2.Generalizing from other plant groups: Bryophytes have a dominant gametophyte, which can lead to confusion.
  [How to avoid]: Learn the specific characteristics of each plant group's life cycle.
 **Quick Tips**:
  1.Remember:  Ferns (pteridophytes) have a large, independent sporophyte. Bryophytes have a large, independent gametophyte.
  2.Visualize the fern plant—the leafy part is the sporophyte.

Mr. NARESH KUMAR K · Answer

Gametophyte

Mr. NARESH KUMAR K · Answer

The correct Option is "Sporophyte"

Mr. NARESH KUMAR K · Answer

Prothallus

Mr. NARESH KUMAR K · Answer

Zygote

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