Category: Biology Second Paper

The dividing tissue that forms the skin of plants is called protoderm. Cells of this tissue form plant skin by atrial division (except bot, rubber). It forms the epiboema of the root.

Scientist Haberland (1914) divided dividing tissue into three parts according to function.
(i) Protoderm: The dividing tissue that forms the skin of plants is called protoderm. Cells of this tissue form plant skin by atrial division (except bot, rubber). It forms the epiboema of the root.
(ii) Procambium: The dividing tissue that forms xylem, phloem and cambium of plants is called procambium. It is scattered in the stems of monocotyledonous plants and in ring form in the stems of dicotyledonous plants. It forms transport tissue or vascular bundles. In many plants it forms a cycle or pericycle.
(iii) Ground meristem: The dividing tissue that gives rise to cortex, pericycle, pith and medulla is called ground meristem.

The dividing tissue located between two permanent tissues is called intercalary dividing tissue. They are primary dividing tissue. It is present in the leaves, midrib, apex and flower buds of plants. Plants include rice, wheat, bamboo, grasses, horsetail (Equigitum), pine etc.

The dividing tissue which is located longitudinally along the sides of the root and stem of the plant is called lateral meristem. It causes secondary growth. It increases the height or width of the plant. Eg- Cork cambium, Interspherical cambium etc.

The dividing tissue located at the apex of the plant root and stem is called apical meristem. These are primary dividing tissues. It divides and causes the plant to grow in length. So the dividing tissue at the top is called growing point.

Scientist Haberland (1914) divided dividing tissue into three parts according to location.
(i) Apical meristem: The dividing tissue located at the apex of the plant root and stem is called apical meristem. These are primary dividing tissues. It divides and causes the plant to grow in length. So the dividing tissue at the top is called growing point.
(ii) Lateral meristem: The dividing tissue which is located longitudinally along the sides of the root and stem of the plant is called lateral meristem. It causes secondary growth. It increases the height or width of the plant. Eg- Cork cambium, Interspherical cambium etc.
(iii) Intercalary meristem: The dividing tissue located between two permanent tissues is called intercalary dividing tissue. They are primary dividing tissue. It is present in the leaves, midrib, apex and flower buds of plants. Plants include rice, wheat, bamboo, grasses, horsetail (Equigitum), pine etc.

The dividing tissue which divides at all levels is called mass dividing tissue. It is randomly arranged to form cell islands. It increases the volume or density of plant organs. For example, embryo, follicle, endosperm, cortex, marrow etc.

The dividing tissue which divides into two layers is called plate meristem. Cells are single-layered and plate-like, so called squamous tissue. Division of plate dividing tissue results in flattened, elongated plant organs that increase in length and width. It increases the volume and area of plant organs. For example, the bark, leaves, etc.

The dividing tissue which divides at one level is called Rib meristem. It is called rib dividing tissue because it looks like the rib of the chest. For example, spinal cord

According to cell division, dividing tissue is divided into three parts.
(i) Rib meristem: The dividing tissue which divides at one level is called Rib meristem. It is called rib dividing tissue because it looks like the rib of the chest. For example, spinal cord.
(ii) Plate meristem: The dividing tissue which divides into two layers is called plate meristem. Cells are single-layered and plate-like, so called squamous tissue. Division of plate dividing tissue results in flattened, elongated plant organs that increase in length and width. It increases the volume and area of plant organs. For example, the bark, leaves, etc.
(iii) Mass meristem: The dividing tissue which divides at all levels is called mass dividing tissue. It is randomly arranged to form cell islands. It increases the volume or density of plant organs. For example, embryo, follicle, endosperm, cortex, marrow etc.