The Question is from neet-botany , and it was created by the author D VINOD

Question

In majority of angiosperms

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Megasporogenesis in Angiosperms
 **Related Topics**: Embryo sac development, Meiosis, Angiosperm reproduction
 **Prerequisites**: Understanding of meiosis, gametogenesis, and the structure of the female gametophyte (embryo sac) in flowering plants.
## SOLUTION PATHWAY
**Given Information**:
The question asks about the characteristic feature of the megasporogenesis (formation of megaspores) in most angiosperms.
**Method & Steps**:
1. Understanding Megasporogenesis:
  Reasoning: Megasporogenesis is the process of formation of megaspores from the megaspore mother cell (MMC) within the ovule.  This process involves meiosis.
  Formula/Rule: None directly applicable, but understanding of meiosis (reduction division) is crucial.
2. Analyzing the options:
  Working: Let's examine each option:
  Option A: A small central cell is present in the embryo sac, which is true but not the defining characteristic of *most* angiosperms.  Some variations exist.
  Option B:  The egg cell typically has a receptive surface, but not necessarily a filiform apparatus in the majority of angiosperms.
  Option C: The number of antipodal cells can vary; it's not consistently numerous in the majority.
  Option D: The megaspore mother cell undergoes meiosis (reduction division), which is a fundamental and consistent step in megasporogenesis in almost all angiosperms.
  Key Point: Meiosis is essential to reduce the chromosome number from diploid (2n) to haploid (n) in the megaspores.
3. Final Step:
  Result: Option D is the correct answer as it describes a universal characteristic of megasporogenesis in angiosperms.
  Verification: The process of megasporogenesis invariably involves meiosis in the megaspore mother cell.
 ## OPTION ANALYSIS
A :x: While true for many, it's not a defining characteristic for the majority of angiosperms.  Variations exist in the number and arrangement of cells in the embryo sac.
B :x: A filiform apparatus is more commonly associated with synergids than the egg cell itself, and its presence isn't universal.
C :x: The number of antipodal cells is variable among angiosperms; it's not consistently numerous in the majority.
D ✓: Reduction division (meiosis) in the megaspore mother cell is a defining and universal step in angiosperm megasporogenesis.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing megasporogenesis with other aspects of female gametophyte development: Focusing on the mature embryo sac structure rather than the initial meiotic event.
  [How to avoid]: Carefully review the process of megasporogenesis and distinguish it from the subsequent development of the embryo sac.
  2. Assuming all angiosperm embryo sacs are identical:  There is some variation in embryo sac development, but meiosis in the MMC is constant.
  [How to avoid]: Understand that while variations exist, the fundamental process of meiosis in the MMC is consistent across the majority of angiosperms.
 **Quick Tips**:
  1.Remember that the megaspore mother cell is diploid (2n), and meiosis is needed to produce haploid (n) megaspores.
  2.Focus on the core process of megasporogenesis: the meiotic division of the MMC.

D VINOD · Answer

a small central cell is present in the embryo sac

D VINOD · Answer

egg has a filiform apparatus

D VINOD · Answer

there are numerous antipodal cells

D VINOD · Answer

The correct Option is "reduction division occurs in the megaspore mother cells"

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