____ acts as a barrier to separate protoplasm from the external environment.

Plasma membrane

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Nuclear membrane

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Tonoplast

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Endoplasmic reticulum

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Solution

The correct option is A Plasma membrane
Cytoplasm and nucleoplasm together are called the protoplasm. Therefore, everything inside the cell that is essential for life together form the protoplasm. The entire contents of the cell is separated from the external environment by a semi-permeable membrane called the plasma membrane.

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