Question

State the location and function of different types of meristem.

Answer 1

ANSWER

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 form intra-fascicular cambial strips and interfascicular strips. In root from conjuctive parenchyma and pericycle. Function: Formation of secondary phloem on outside and secondary xylem on inner side. Vascular rays are formed at intervals for radial conduction.

Hope it helps

Answer 2

Meristems are classified into three types based on locations: Apical, Intercalary and lateral

Step by step explanation:

Meristems are specialized regions which help in the plant growth. They are the regions for active and rapid cell multiplication. They are classified into three types on the basis of location:

1) Apical: They are present around the apices of stem, root and the branches.

Function: Aids in the growth of primary tissues.

2) Intercalary: These are found on the upper and the lower surface of the stem nodes and the leaf bases.

Function: Aids in the growth of internodes and leaves. It is also responsible for the correction of the position of lodged stems.

3) Lateral: Further sub- classified into the following:

i) Phellogen (Cork Cambium): It is developed from the hypodermis in the stems and pericycle in case of roots.

Function: It forms a protective cork (phellem) and aerating lenticles externally and the secondary cortex (phelloderm) internally.

ii) Vascular Cambium: It is present in the stem, in the form of intra-fascicular cambial strip and inter-fascicular strips. It is also present in the root from the conjunctive parenchyma and the pericycle.

Function: Helps in the formation of secondary phloem externally and the secondary xylem internally.