Question

Which of the following is not an example of active transport? i. facilitated diffusion ii. osmosis iii. diffusion

Answer 1

Answer:

facilitated diffusion (Ans. I)

Explanation:

Active transport: It is the type of transport where solute can move uphill from the region of lower concentration to higher concentration and it requires some form of chemical energy.

Osmosis and Diffusion are types of active transport.

Passive transport: Facilitated diffusion is a type of passive transport where solute can move downhill from the region of higher concentration to lower concentration and does not require any energy.

Answer 2

Osmosis and facilitated diffusion are passive diffusion phenomena, where there is no energy expenditure and substances are transported down the contraction gradient.

What is active transport?

It is that process in which solutes are transported against the concentration gradient, requires an expenditure of metabolic energy (ATP hydrolysis).

Examples of active transport

• The action potential where the cells of the human body carry out an electrical process called the sodium potassium pump “ATPase”.

• Calcium pump in the cell membrane where a carrier protein works with ATP to absorb extracellular calcium.

• Phagocytosis is an active transport mechanism that ingests particles through sacs formed from the cell membrane.

Therefore, we can conclude that the active transport is the transport of a solute against its electrochemical gradient that requires metabolic energy expenditure, osmosis and facilitated diffusion are not examples of this type of transport.

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