The Question is from neet-botany sexual-reproduction-in-flowering-plants , and it was created by the author Mr. NARESH KUMAR K

Question

In which of the following plant structures does a haploid generation reside within a diploid generation?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: Option D
## CONCEPT FRAMEWORK
 **Primary Concept**: Alternation of generations in plants
 **Related Topics**: Plant reproduction, gametophyte, sporophyte, meiosis, mitosis
 **Prerequisites**: Understanding of haploid and diploid chromosome numbers, the life cycle of plants.
## SOLUTION PATHWAY
**Given Information**:
  The question asks to identify the structure where a haploid generation (gametophyte) is found within a diploid generation (sporophyte).
  [Important conditions]:  We need to consider the ploidy level of both the inner and outer structures.
**Method & Steps**:
 1. Analyze each option's ploidy:
  Reasoning: The diploid generation (sporophyte) produces haploid spores through meiosis. These spores develop into the haploid gametophyte generation, which produces gametes.
  Formula/Rule:  Haploid (n) vs. Diploid (2n) chromosome numbers.
 2. Identify the correct option:
  Working: Let's examine each option:
   A. Pollen grains (n) are inside the anther (2n). However, the anther is part of the sporophyte, not the gametophyte.  The pollen grain itself is haploid, but the question is asking for a haploid generation *within* a diploid generation.
   B. A germinated pollen grain contains two male gametes (n), but this is still primarily the haploid generation. It doesn't fulfill the condition of being *within* a diploid generation.
   C. A seed (2n) is inside the fruit (2n). Both are diploid.
   D. The embryo sac (n), which is the female gametophyte, is found inside the ovule (2n), which is part of the sporophyte.  This fits the description perfectly.
  Key Point: The key is to recognize the nested structure of the haploid gametophyte inside the diploid sporophyte.
 3. Final step:
  Result: Option D is the correct answer.
  Verification: The embryo sac (female gametophyte, n) is clearly located within the ovule (part of the sporophyte, 2n).
 ## OPTION ANALYSIS
A :x: The pollen grain is haploid, but the question asks for a haploid *generation* within a diploid *generation*.  The anther is diploid, but the pollen grain is independent and not fully enclosed within the anther in a way that constitutes a generation within a generation.
B :x: Similar to A, this is a haploid structure, not a haploid generation contained within a diploid generation.
 C :x: Both the seed and fruit are diploid structures.
D ✓: The embryo sac (megagametophyte) is the haploid female gametophyte generation, and it resides inside the ovule, which is a diploid structure of the sporophyte generation.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the terms gametophyte and sporophyte:  Understanding the ploidy levels (n vs. 2n) and the roles of each generation is crucial.
  2.Overlooking the nested structure: The question emphasizes the containment of one generation within another; simply identifying haploid structures is insufficient.
 **Quick Tips**:
  1.Draw a diagram of the alternation of generations in plants to visualize the relationship between sporophyte and gametophyte.
  2.Remember that the gametophyte is always haploid and the sporophyte is always diploid.

Mr. NARESH KUMAR K · Answer

Pollen grains inside the anther

Mr. NARESH KUMAR K · Answer

Germinated pollen grain with two male gametes

Mr. NARESH KUMAR K · Answer

Seed inside the fruit

Mr. NARESH KUMAR K · Answer

The correct Option is "Embryo sac inside the ovule"

NEET Botany Sexual Reproduction in Flowering Plants MCQs

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