Biology Biotechnology PMDC Conceptual Practice
PMDC Verified Question 18 of 65
Cellular totipotency was demonstrated by F.C. Steward using root phloem of:
A
Radish
B
Potato
C
Carrot
D
Tomato
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Carrot
Concept:

Cellular totipotency in plant tissue culture systems.

Solution:

F.C. Steward (1958) demonstrated that differentiated plant somatic cells retain full genetic capacity (totipotency) by regenerating whole, fertile plants from cultured root phloem explants of wild carrot (Daucus carota).

Why other options are incorrect:

  • Radish: Not used in Steward's original plant tissue culture experiments.


  • Potato: Used in later tissue culture and protoplast fusion studies, not Steward's 1958 experiment.


  • Tomato: Used extensively in transgenic fruit-ripening experiments (e.g., Flavr Savr), not the original totipotency demonstration.

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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