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

Question

What is the ploidy of the endosperm in a typical angiosperm?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [C] Triploid (3n)
## CONCEPT FRAMEWORK
	**Primary Concept**: Endosperm development in angiosperms
	**Related Topics**: Plant reproductive biology, seed development, fertilization process
	**Prerequisites**: Understanding of plant cell biology and ploidy levels
## SOLUTION PATHWAY
**Given Information**:
		- Angiosperms undergo a process called double fertilization.
		- One sperm fertilizes the egg cell, forming a diploid zygote (2n).
		- The other sperm fertilizes the two polar nuclei, forming the endosperm.
**Method & Steps**:
	1. Identify the fertilization events occurring during double fertilization.
		Reasoning: In angiosperms, double fertilization leads to the formation of both the zygote and the endosperm.
		Formula/Rule: The endosperm is formed by the fusion of one sperm cell with two polar nuclei.
	2. Determine the ploidy level of the endosperm.
		Working: Since the two polar nuclei are haploid (n), their fusion with one sperm (n) results in a triploid (3n) endosperm.
		Key Point: The endosperm serves as a nutrient source for the developing embryo.
	3. Confirm the ploidy level of the endosperm.
		Result: The endosperm is triploid (3n).
		Verification: This is a well-established concept in plant biology and is consistent across most angiosperms.
## OPTION ANALYSIS
[A] :x: Haploid (n): The endosperm is not haploid; it is formed by the fusion of three nuclei.
[B] :x: Diploid (2n): The endosperm is not diploid; it contains three sets of chromosomes.
[C] ✓: Triploid (3n): Correct, as explained above.
[D] :x: Tetraploid (4n): The endosperm does not have four sets of chromosomes; it is triploid.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing endosperm with the zygote: Remember that the zygote is diploid (2n), while the endosperm is triploid (3n).
		2. Misunderstanding fertilization: Double fertilization involves one sperm fusing with the egg and another with the polar nuclei, leading to the triploid endosperm.
	**Quick Tips**:
		1. Remember "3n for endosperm, 2n for embryo" as a mnemonic for ploidy levels in angiosperms.
		2. Visualize double fertilization to better grasp the process and outcomes.

K SURESH KUMAR · Answer

Haploid (n)

K SURESH KUMAR · Answer

Diploid (2n)

K SURESH KUMAR · Answer

The correct Option is "Triploid (3n)"

K SURESH KUMAR · Answer

Tetraploid (4n)

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