Question

Which is essential for the growth of root tip?
A. Ca
B. Mn
C. Zn
D. Fe

Answer 1

Hint: Roots of plants or trees grow in length only from their ends. The tip of the root is covered by a thimble-shaped structure known as root cap, which helps to protect the growing tip as it makes its way through the soil. Just behind the root cap lies the tissue called apical meristem, a tissue of actively dividing cells.

Complete answer:
As a plant grows above the surface, there is also a growth that occurs in plants that is within the soil. Roots need to grow in order to better support the plant and to better absorb both water and nutrients for the growing plant and this is the main function of roots.The root cap protects the growing tip in plants. It secretes a mucilaginous substance to ease the movement of the root through soil, and may also be involved in communication with the soil microbiota.
"Calcium" is essential for the growth of root tips. Calcium is present in the cell walls in the form of ‘calcium pectate’. It helps in holding the plant’s cells together and for growth of the new cells. Plants derive its calcium(Ca) from the soil, which it then transports to the different parts of the plant for utilization. It is required in the formation of the middle lamella of the cell wall that is present in the form of calcium pectate.
Manganese (Mn) is an important micronutrient that helps in plant growth and development and sustains metabolic roles within different plant cell compartments. The metal is an essential cofactor for the oxygen-evolving complex (OEC) of the photosynthetic machinery, catalyzing the water-splitting reaction in photosystem II Zinc(Zn) is used in the formation of chlorophyll and some carbohydrates, conversion of starches to sugars and its presence in plant tissue helps the plant to withstand cold temperatures.
Iron(Fe) is an essential micronutrient for almost all living organisms because it plays a critical role in metabolic processes such as DNA synthesis, respiration, and photosynthesis. In plants, iron is involved in the synthesis of chlorophyll, and it is essential for the maintenance of chloroplast structure and function.

Therefore, the correct answer is option A that is Calcium.

Note:
Root is a part of a vascular plant normally underground. The primary functions of roots are anchorage of the plant, absorption of water and dissolved minerals and conduction of these to the stem, and storage of reserve foods. The root differs from the stem mainly by lacking leaf scars and buds, having a root cap, and having branches that originate from internal tissue rather than from buds.