stem cell research essays

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

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..

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 continue their maturation in the bone marrow ..

Epidermis is the outermost covering of the stem. It is represented by a single layer of compactly arranged, barrel-shaped parenchyma cells. Intercellular spaces are absent. The cells are slightly thick walled. Epidermis shows the presence of numerous multicellula..

Provide mechanical support to the stem. Being extensible, these cells readily adapt themselves to the rapid elongation of the stem..

In this type the deposition of hemicellulose and pectin occurs only in the angles between the cells. The cells are compactly arranged and intercellular spaces are absent. It is found in the stem, usually below the epidermis, forming a region called hypoderm..

These are ordinary parenchymatous cells and are living. They are absent in monocot stems..

Many years ago, Frederick Steward and his co-workers cultured cells from carrot plants and induced some of them to develop into small embryos. Some of these embryos grew into whole plants. Today, researchers routinely regenerate crops, plants and many other plant species f..