Mobile vs. Immoblie Elements

In the context of plant nutrition, elements are classified as either mobile or immobile. This classification is based on the ability of the element to be transported within the plant from older to younger tissues.

Mobile Elements

Mobile elements are those that can be easily transported within the plant from the older to the younger tissues. These elements can be retranslocated from the older leaves to the younger ones, where they are needed for critical physiological processes such as photosynthesis and respiration. Examples of mobile elements include nitrogen, phosphorous, and potassium.

Immobile Elements

Immobile elements, on the other hand, are those that cannot be easily transported within the plant from older to younger tissues. These elements are called immobile because they are fixed in place and cannot be retranslocated from the older leaves to the younger ones. This means that they cannot be used for physiological processes in the younger tissues. Examples of immobile elements include calcium, boron, and sulphur.

Sulphur Element

The sulphur element is classified as both mobile and immobile, depending on the context in which it is being used. In transport in the plant, sulphur is considered to be a mobile element because it can be easily transported from older to younger tissues. However, in mineral nutrition, sulphur is considered to be an immobile element because it cannot be easily retranslocated from older to younger tissues.

Conclusion

In conclusion, the classification of an element as either mobile or immobile depends on its ability to be transported within the plant from older to younger tissues. While the sulphur element is considered to be mobile in transport within the plant, it is immobile in mineral nutrition.

Actually sulphur is immobile. Check it out. There is NCERT correction in the chapter Mineral nutrition.

Sorry friend I can't attach a screen shot with my answer. U plz check New NCERT pdf of that chapter.