Question

In the light of carrier concept, the transport of ion across the membrane against concentration gradient is

• A. Passive process
• B. Non-osmotic process
• C. Osmotic process
• D. Active process

Answer 1

Answer: (D)

Active process

According to carrier concept for transport of ion in plants, transport is mediated by specific carriers. When the ion is transported against the concentration gradient, the ion carrier is activated in presence of ATP and a kinase enzyme. The activated carrier forms a complex with an ion at the outer surface and transported in. Because this process involves ATP, hence, it is called active process.

So, the correct answer is 'Active process'