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Question

Protein pumps help in


A
simple diffusion
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B
facilitated diffusion
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C
active transport
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D
imbibition
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Solution

The correct option is B active transport
Pumps are proteins present in the biological membranes that transport the molecules against the concentration gradient and hence there is an expenditure of energy (ATP). Pumps help in the active transport of molecules from a region of lower concentration to a region of higher concentration. This type of transport is called uphill transport. Ex: Sodium-potassium pump. The sodium-potassium pump transports three sodium ions to the exterior and two potassium ions to the interior of the cell.
In simple diffusion, the molecules move from the region of higher concentration to lower concentration without the help of any membrane proteins. 
In facilitated diffusion, the transport of molecules is along the concentration gradient with the help of channel proteins and carrier proteins. The movement of molecules through these transport proteins does not require energy.
Adsorption (surface attraction) of water by hydrophilic (water-loving) substances is called imbibition. This is a special type of diffusion and causes an increase in the volume of the substances. The plant cell wall has cellulose and pectin which are hydrophilic and adsorb water onto their surfaces.
The solids that adsorb water are known as imbibants. They include substances like cellulose, pectin, starch and agar.
The water (liquid) that is adsorbed is called imbibate.
 

Biology

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