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Question:

Which is essential for the growth of root tip?

Zn2+

Ca2+

Fe2+

Mn2+

Solution:

Calcium ions are used in new cell walls synthesis, particularly the middle lamellae that separate newly divided cells. It is also used in the mitotic spindle during cell division and calcium deficiency causes necrosis of young meristematic regions, such root and leaf tips, the sites of rapid cell division and wall formation. Therefore, the correct answer is option B (Ca2+).