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

Question

A unique feature of angiosperm fertilization is the formation of both a zygote and an endosperm nucleus.  If a mutation occurred preventing the fusion of one of the male gametes with the polar nuclei, what would be the MOST likely direct consequence?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Angiosperm double fertilization
 **Related Topics**: Plant reproduction, endosperm development, seed formation
 **Prerequisites**: Understanding of the process of double fertilization in angiosperms.
## SOLUTION PATHWAY
**Given Information**:
  A mutation prevents the fusion of one male gamete with the polar nuclei.
  Double fertilization produces both a zygote and endosperm.
**Method & Steps**:
 1. Understand double fertilization:
  Reasoning: In angiosperms, one sperm fertilizes the egg cell to form the diploid zygote (2n), while the other sperm fertilizes two polar nuclei to form the triploid endosperm (3n). The endosperm provides nourishment for the developing embryo.
  Formula/Rule:  None directly applicable, but understanding the chromosome numbers (n, 2n, 3n) is crucial.
 2. Analyze the mutation's effect:
  Working: If the fusion of one male gamete with the polar nuclei is prevented, the triploid endosperm will not form.  The zygote formation (from the egg and the other sperm) would remain unaffected.
  Key Point: The endosperm is essential for seed development.  Without it, the seed lacks the necessary nutrients for germination and growth.
 3. Determine the most likely consequence:
  Result: The most direct consequence of preventing endosperm formation is that the endosperm would not develop, thus impacting seed viability.
  Verification: This aligns perfectly with the role of the endosperm in seed development.
 ## OPTION ANALYSIS
A ✓: Endosperm would not develop, impacting seed viability.  This is the correct answer because the failure of one fertilization event directly leads to a lack of endosperm, which is essential for seed development and viability.
B :x: The zygote would fail to form, preventing embryo development. This is incorrect because only the fusion of the sperm with polar nuclei is affected; the zygote formation (egg + sperm) remains unaffected.
C :x: A triploid zygote would form instead of a diploid zygote. This is incorrect; the zygote remains diploid. The triploid structure affected is the endosperm.
D :x: The ovule would develop into a seedless fruit.  This is incorrect.  While the lack of a viable seed might influence fruit development, the direct consequence is the absence of endosperm, not a seedless fruit.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the roles of the zygote and endosperm: Remember the zygote develops into the embryo, while the endosperm provides nutrition.
  2.Focusing on indirect consequences: The question asks for the MOST LIKELY DIRECT consequence.  Fruit development is an indirect consequence.
 **Quick Tips**:
  1.Visualize the process of double fertilization to better understand the roles of each sperm cell.
  2.Memorize the ploidy levels of the zygote (2n) and endosperm (3n).

Mr. NARESH KUMAR K · Answer

The correct Option is "Endosperm would not develop, impacting seed viability."

Mr. NARESH KUMAR K · Answer

The zygote would fail to form, preventing embryo development.

Mr. NARESH KUMAR K · Answer

A triploid zygote would form instead of a diploid zygote.

Mr. NARESH KUMAR K · Answer

The ovule would develop into a seedless fruit.

NEET Botany Sexual Reproduction in Flowering Plants Double Fertilization MCQs

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