2006-11-19 13:02:40 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Botany
Broadly it can be described as a mass of undifferentiated cells.These may be on the plant part (due to some infection) or on the media as in tissue culture labs.
2006-11-20 00:41:46 · answer #1 · answered by Anonymous · 0⤊ 0⤋
A callus is usually sustained on gel media, much in the same manner as bacteria are grown. Sufficient media consists of agar and the usual mix of macronutrients and micronutrients for the given cell type. For plant cells, enrichment with Nitrogen, Phosphorus, and Potassium is especially important. Water is provided as a constituent part of the gel media.
http://en.wikipedia.org/wiki/Callus_(cell_biology)
2006-11-19 14:26:24 · answer #2 · answered by t_roy_e 3 · 0⤊ 0⤋
A thickening of the epidermis (skin) in response to increased usage that would cause harm to the lower levels of epidermis without it....remember the skin is the largest organ of the human body and it's function is to protect all other systems of the body... it is basically a living 'shield'. The outer layers of this organ are non-living and the inner layers are alive.
2006-11-19 13:22:52 · answer #3 · answered by Anonymous · 0⤊ 1⤋
Skin that got thicker because of friction
2006-11-19 17:20:15 · answer #4 · answered by kihela 3 · 0⤊ 0⤋