kerato- or kerat- also cerato- or cerat- pref. 1. Horn; horny: keratosis. 2. Cornea: keratectomy. [Greek kerÄto-, horn, from keras, kerÄt-; see ker- in Indo-European roots.] kerato- or before a vowel kerat- combining form 1. indicating horn or a horny substance: keratin; keratogenous. 2. (Medicine) indicating the cornea: keratoplasty. [from Greek kerat-, keras horn] kerato- a combining form meaning âcorneaâ: keratoplasty.
Early root growth is one of the functions of the apical meristem located near the tip of the root. The meristem cells more or less continuously divide, producing more meristem, root cap cells (these are sacrificed to protect the meristem), and undifferentiated root cells.
1.Xylem parenchyma are the only living cells of Xylem,rest all cells are dead. 2.Phloem fibres are the only dead cells of phloem,rest all are living. 3.Vessels in xylem and seive tubes in phloem are a characterstic feature of Angiosperms i.e. flowering plants. 4.Gymnosperms and pteridophytes have trachieds for ascent of sap(conduction of water) and sieve cells for translocation.