Question

Which of the group of elements is not essential
for a normal plant ?
(a) K, Ca, Mg (b) Fe, Zn, Mn, B
(c) Pb, I, Na (d) Mg, Fe, Mo

Answer 1

Answer:

lead , iodine ,sodium etc

Answer 2

Option (c) is the right answer

Lead (Pb) , Iodine (I) and Sodium ( Na) are the group of elements which are not necessary for a normal plant.

- All the elements which are included in the growth of any normal plant are not classified as essential elements.

- Essential elements (also classified major elements) are those elements which are very necessary for every normal plant for it's growth , functioning of enzymes and other necessary development processes.

- All the three listed elements above ,i.e, lead , iodine and sodium are called as non-essential elements of the plants.