Question

By which mechanisms, the salt resistant plants get rid of excess $N{a^ + }$ ions to the outer side through the roots.
A. ${H^ + }$ - ATPase uniport system
B. $N{a^ + }$ – uniport system
C. ${H^ + }$-$C{l^ - }$ symport system
D. $N{a^ + }$ – ${H^ + }$ antiport system

Answer 1

Hint: Membrane transportation is important for both plants and animals. From the intracellular membrane to the outer membrane transportation occurs and ions are being exchanged. There are three types of system for membrane transportation- uniport system, symport system and antiport system. They help in exchanging ions and not overflowing ions.

Complete answer:
Option A: ${H^ + }$ - ATPase uniport system- uniport system is a single direction system which allows influx or outflux of ions in a particular single direction or one way.
Option A is not the correct answer.
Option B: $N{a^ + }$ – uniport system- sodium ions concentration and potassium ion gradient are usually uniport.
Option B is not the correct answer.
Option C: ${H^ + }$-$C{l^ - }$ symport system- symport is bi-directional system or two-way exporter. They allow the flow of ions from both directions.
Option C is not the correct answer.
Option D: $N{a^ + }$ – ${H^ + }$ antiport system- antiport system allows two or more ions across the phospholipid membrane that is- sodium and hydrogen ions. One inward and other outward respectively.
Option D is the correct answer.

Therefore, Option D is the correct answer.

Note:
If a plant is not supposed to eliminate excess sodium ions it can cause plant health detrition. As excessive nutrient medium not only drains out naturally from cell sap but by chance it stays, the proper growth or abnormal growth of plant parts can be seen resulting in over-growth of fruits or sterile flowers or fruit destruction can be seen.