Class NEET 2026 ALL Q #2072
COMPETENCY BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
If the diploid chromosome number of typical angiosperm is 36, what would be the chromosome number in its endosperm?
(A) 72
(B) 18
(C) 36
(D) 54
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Correct Answer: D

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Detailed Solution

Step 1: Identify the ploidy of the given organism

The problem states that the diploid chromosome number ($2n$) of the angiosperm is 36. Therefore, the haploid number ($n$) is calculated as: $$n = \frac{36}{2} = 18$$

Step 2: Determine the ploidy of the endosperm

In angiosperms, the endosperm is formed through the process of double fertilization, specifically the fusion of one male gamete ($n$) with two polar nuclei ($n + n$). This results in a triploid ($3n$) structure.

Step 3: Calculate the chromosome number

Using the haploid number ($n = 18$) determined in Step 1, the chromosome number in the triploid endosperm is: $$3n = 3 \times 18 = 54$$

Final Answer: 54

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must utilize their knowledge of reproductive biology (double fertilization) to calculate values for a specific biological scenario.
Knowledge Dimension: CONCEPTUAL
Justification: The question tests the understanding of the ploidy levels in angiosperm life cycles, which is a core conceptual pillar of plant reproduction.
Syllabus Audit: In the context of NEET, this is classified as COMPETENCY. This question requires the student to bridge the gap between theoretical knowledge of fertilization and numerical application, which is a standard pattern in NEET Biology.

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