Question

write the function of three meristernes down the three meristernes​

Answer 1

Answer:

Meristems are of three types depending on their location. It is present at the root apex and the shoot apex. The shoot apical meristem is present at the tip of the shoots and its active division results in the elongation of the stem and formation of new leaves. The root apical meristem helps in root elongation.

Explanation:

On the basis of location, meristems are of three types, apical, intercalary and lateral.

(i) Apical: It is present at the apices of stem, root and their branches.

Functions: It helps in growth in length and formation of primary tissues.

(ii) Intercalary: It is found above or below stem nodes and leaf bases.

Functions: It helps in growth of internodes, growth in leaves and correction of position in lodged stems.

(iii) Lateral: 

(a) Phellogen (Cork cambium): It develops from hypodermis in stems and pericycle in roots. Function: Formation of protective cork (phellem) and aerating lenticles on the outside and secondary cortex (phelloderm) on the inner side. 

(b) Vascular Cambium: In stem it is formed from intra-fascicular cambial strips and interfascicular strips. In root it develops from conjuctive parenchyma and pericycle. Function: Formation of secondary phloem on  the outer side and secondary xylem on the inner side. Vascular rays are formed at intervals for radial conduction.