Biology Cell NUMS 2023
PMDC Verified Question 31 of 143
Secondary cell wall in plants is present:
A
In between two primary cell walls
B
Between the primary cell wall and plasma membrane
C
Inner to plasma membrane
D
Outer to primary cell wall
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Between the primary cell wall and plasma membrane
Concept: As a plant cell matures, it may lay down additional, stronger wall layers inward from the original wall.

Solution: The primary cell wall is secreted first. Once the cell stops growing, a thicker, rigid secondary cell wall is secreted by the plasma membrane underneath the primary wall. Thus, it is located between the primary cell wall and the plasma membrane.

Distractor Autopsy: The middle lamella lies outside the primary wall (between adjacent cells). Nothing is structural "inner to the plasma membrane" except the cytoskeleton.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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