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Which of these scientists concluded that the cell wall was a unique feature of plant cells?

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Which of these scientists concluded that the cell wall was a unique feature of plant cells?

(a) Matthias Schleiden

(b) Theodore Schwann

(c) Robert Koch

(d) Rudolf Virchow

This question was posed to me in an online quiz.

My question is taken from Cell Theory in division Cell : The Unit of Life of Biology – Class 11

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The correct answer is (b) Theodore Schwann

Explanation: Theodore Schwann, a British zoologist, concluded from his studies that the cell wall was a unique feature of plant cells. He also observed various types of animal cells and concluded that they were surrounded by a thin layer, which is the plasma membrane.

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