It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves.
Name two elements which are highly mobile and two which are relatively immobile.

It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves. Does it indicate that the element is actively mobizied or relatively immobile?

It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves. How is the aspect of mobility of elements important to horti culture and agriculture?

give names of two elements which are placed in the group of carbon and have same valency?

Deficiency of which element is responsible for early fall of leaves?

Name the element which has no neutrons in the nucleus of its atom.

Name two other elements which are in the same family as (i) carbon (II) fluorine(iii) sodium

Name two radioactive elements, which are not found in observable quantity in nature, why is it so?

Which of the following statements are true? If false, correct them: Nitrogen as a nutrient element, is highly immobile in the plants.

Which element has: Two shells both of which are completely filled with electrons?