Ncert Exercises & Solutions

Given below is a table. Fill in the gaps.

Property

Simple

diffusion

Facilitated transport

Active

transport

Highly selective

Uphill transport

Requirse ATP

Yes

Property

Simple

diffusion

Facilitated transport

Active

transport

Highly selective

Uphill transport

Requirse ATP

Yes

Active Transport It uses energy to pump molecules against a concentration gradient. Hence,different proteins in the membrane play a majorrole in active transport.
Carrier protein involved in active transport is very specific in what it carries across the
membrane.
Facilitated Transport In facilitated transport special proteins help in movement of substances across the membrane without the expenditure of ATP. Facilitated transport is
very specific asit allowscell to select substances for uptake.
Simple Diffusion It is a physical phenomenon which involves the movementof water from
higher concentration to lower concentration. It is not a selective process and do not require energy.

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