stem cell specialization

Generally, the stems are aerial and grow above the soil surface. Sometimes, the stem becomes variously modified to perform special functions like perennation, vegetative propagation and food storage. The modified stems may be grouped under three heads viz, un..

Generally, the stems are aerial and grow above the soil surface. Sometimes, the stem becomes variously modified to perform special functions like perennation, vegetative propagation and food storage. The modified stems may be grouped under three heads v..

Auxins promote elongation and growth of stems and roots and enlargement of many fruits by stimulating elongation of cells in all directio..

.8 - Cell Structure of Cyanobacteria The planktonic forms contain gas vacuoles in their cells to help in floating. Some cyanophycean members possess special types of cells called heterocysts, as in Anabena and Nostoc. They are large, thick walled, round ..

Aerial Stem Modifications - In some plants the aerial stem is modified to perform a variety of special functions. The aerial stem modifications are as follo..

Epidermis is the outermost covering of the stem represented by a single layer of compactly arranged, barrel-shaped parenchyma cells. Intercellular spaces are absent. Trichomes are absent. A cuticle is present. The epidermis contains numerous minute openings called stomata...

Circular in appearances. Contains passage cells and casparian strip..

Characters Monocot stem Monocot Root 1.Epidermis a.Nature of the cells Thick walled Thin walled b.Epidermal hairs Absent Present, unicellular root hairs c.Stomata Present Absent 2. Hypodermis Present, made up of sclerenchyma Abse..

. It is applicable to almost all living organisms and it incorporates nearly all the modern findings about cells. In unicellular organisms, the single cell that comprises the body leads a totally autonomous existance. The various cell organelles perform the vital body ..

Cells of the Immune System - Lymphocytes are the main cells of the immune system. They arise from stem cells present in the liver in the foetus and in the bone marrow in the adult. Comparison of cell-mediated and humoral immunity Some of them contin..