By Team Aakash Byju's | 27th January 2023

Woman Reading 02

Why Is Plasma Membrane Selectively Permeable?

Assertion: Plasma membrane is selectively permeable.

Reason: Plasma membrane allows some molecules to pass through more easily than others.

Woman Reading 02
Man Reading

A

Both Assertion and Reason are true and Reason is the correct explanation for Assertion.

Your options are:

B

Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.

(Continues)

C

Assertion is true but Reason is false.

D

Both Assertion and Reason are false.

Brief Explanation

The correct answer is  A) Both Assertion and Reason are true and Reason is the correct explanation for Assertion.

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In plant cells, the plasma membrane, also known as the cell membrane is located below the cell wall and functions as the outer layer of the cell.

Plant Cell

It consists of a phospholipid bilayer structure with embedded proteins that resembles a mosaic.

Cell Membrane

Glycolipid

Globular Protein

Phospholipid bilayer

Channel Protein

Integral Protein

Peripheral  Protein

Cholesterol

Alpha-Helix Protein

It is a selectively permeable membrane that allows the transport of solvents like water across it and does not allow the transport of solute particles through the plasma membrane.

Plasma Membrane

Channel Open

Channel Closed

Cytosol

Extracellular Fluid

The movement of the particles over the membrane can either be passive, where no cellular energy is required or active, where the cells must expend energy for transport.

Facilitated Diffusion

Diffusion

Passive Transport

Active Transport