Question

Examples of lateral meristems are
A. Phellogen and procambium
B. Fascicular cambium and procambium
C. Procambium and dermatogen
D. Fascicular cambium and cambium

Answer 1

Hint: Secondary growth refers to the growth that occurs after cell division in the cambia or lateral meristems and which causes the stems and roots to dense. Resulting from lateral meristems, secondary growth raises the girth of the plant root or stem, rather than its length.

Complete Answer:
The meristem is a kind of tissue present in plants. It is composed of meristematic cells which are able to divide a cell. Cells in the meristem can grow into all the other tissues and organs that produce in plants. Differentiated plant cells generally cannot divide or produce cells of a different type.

- Phellogen is defined as the meristematic cell layer responsible for the development of the periderm.
- The procambium is a meristematic tissue concerned with providing the primary tissues of the vascular system.
- Dermatogen is the external primary meristem of a plant or plant portion which is based on the histogen theory creating epidermis.
- There are mainly two kinds of secondary meristems which are also known as the lateral meristems due to the fact that they enclose the stable stem of a plant and cause it to develop laterally means bigger in diameter. Vascular cambium develops secondary phloem and secondary xylem. Lateral meristem is present besides the corner portion, as a root or stem. The meristems present in vascular plants are the cork cambium and the fascicular cambium where secondary growth occurs, causing rise in stem girth.

Thus, the correct option is D. i.e. Fascicular cambium and cambium.

Note: Lateral meristem (as the cambium and cork cambium) that is arranged parallel to the sides of an organ and that is responsible for increase in diameter of the organ compare apical meristem, intercalary meristem. The lateral meristem is the reason for lateral growth, or growth in length. This kind of growth is referred to as secondary growth because this development surrounds an already stabilized stem.