Plasma Membrane:
1. It is a continuous membrane without having any pore and surrounds the protoplasm.
2. It consists of a single unit membrane.
3. It persists throughout the life period of cell.
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4. It is semi permeable and regulates flow of material between protoplasm the external medium.
Nuclear Membrane:
1. It is a discontinuous membrane with complex pores and surrounds the nucleus.
2. It consists of two unit membranes, hence called nuclear envelop.
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3. It disappears during cell division.
4. It regulates flow of material between nucleoplasm and cytoplasm.