Question

Accessory cambia are
A. Intercalary meristems
B. Secondary meristems
C. Primary meristems
D. Partly primary and partly secondary meristem

Answer 1

Hint:-
Cambia in plants are the layers of tissue formed by undifferentiated cells which are present between the xylem and phloem of the plant and are capable of providing growth to the plant which is called secondary growth by cell division in cambria. Secondary growth results in increase in girth of roots and stems.

Complete step-by-step solution:-
As mentioned above cambia or also we can say secondary meristems are groups of cells which are responsible for the growth of roots and stems both not in an elongated way on the axis but it helps in thickening of root and stem. The thick solid woody stem that we normally see of trees is due to secondary growth by cambia present in between its xylem and phloem. It is referred to as secondary growth because of its nature of producing secondary xylem cells towards its central axis that results in thickness of root and stem. Vascular cambium is the main tissue responsible for the radial growth of the plant rather than an elongated growth towards the axis. It increases the diameter of the stem and root of a plant. Formation of successive rings of the cells of accessory cambia result in thickening or radial growth of the plant. Hence our answer goes with the option (B) Secondary meristems.


Note:-
 Xylem and phloem are the vascular tissue present in the plants which play an important role for the growth and development of plants. Xylem is responsible for transportation of water and minerals throughout the plant body whereas phloem is responsible for transportation of food prepared by the leaves of plants to various parts, tissues and cells of the plant.