The Question is from neet-botany plant-kingdom life-cycles-of-different-plant-groups, and it was created by the author D VINOD

Question

Which of the following statements regarding the life cycle of *Selaginella* is INCORRECT?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Life cycle of *Selaginella* (a heterosporous pteridophyte)
 **Related Topics**: Heterospory, Megaspores, Microspores, Gametophytes, Sporophytes, Embryo development
 **Prerequisites**: Understanding of basic plant life cycles, alternation of generations.
## SOLUTION PATHWAY
**Given Information**:
Four statements regarding the life cycle of *Selaginella* are provided.
**Method & Steps**:
1. Analyze each statement concerning the *Selaginella* life cycle.
   Reasoning:  *Selaginella* exhibits heterospory, meaning it produces two types of spores: megaspores (female) and microspores (male). These spores germinate into separate gametophytes.
2. Evaluate the correctness of each statement.
   Working:
     A.  Megaspores and microspores do germinate into female and male gametophytes, respectively. This is correct.
     B. The zygote develops into an embryo within the female gametophyte. However, the female gametophyte is *dependent* on the sporophyte for nutrition, unlike what the statement claims.
     C.  The sporophyte is indeed the dominant, independent phase in the *Selaginella* life cycle. This is correct.
     D. *Selaginella* is heterosporous, producing both megaspores and microspores. This is correct.
3. Identify the incorrect statement.
   Result: Statement B is incorrect because the female gametophyte is not independent of the sporophyte; it receives nutrition from it.
   Verification: Refer to standard texts on plant biology and the life cycle of *Selaginella* to confirm the dependence of the female gametophyte.
 ## OPTION ANALYSIS
A ✓: Correct description of spore germination.
B :x: Incorrect; the female gametophyte is dependent on the sporophyte.
C :x: Correct description of the dominant phase.
D :x: Correct statement about heterospory.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the dependence of the gametophyte on the sporophyte in heterosporous plants:  Remember that even though the gametophyte is relatively large and independent-looking in heterosporous plants, it still typically derives nutrition from the sporophyte.
  2.Overlooking the differences between homosporous and heterosporous life cycles:  Understanding the distinctions between the spore types and the resulting gametophytes is crucial.
 **Quick Tips**:
  1.Visualize the life cycle diagram of *Selaginella* to understand the relationships between the sporophyte and gametophyte generations.
  2.Remember the key characteristic of heterospory: two types of spores and gametophytes.

D VINOD · Answer

The megaspores and microspores germinate to give rise to female and male gametophytes, respectively.

D VINOD · Answer

The correct Option is "The development of the zygote into the embryo takes place within the female gametophyte, which is independent of the sporophyte."

D VINOD · Answer

The sporophyte is the dominant phase in the life cycle.

D VINOD · Answer

*Selaginella* exhibits heterospory.

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