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.
only leaves have phloem and only roots have xylem. b. the cells of roots have cell walls that are lacking in leaf cells. c. a waxy cuticle covers leaves but is absent in roots. d. vascular tissue is found in roots but it is absent from leaves.hich functional plant cells lack a nucleus? a. xylem only b. sieve tube cells only c. companion cells only d. both companion and parenchyma cells e. both xylem and sieve tube cells 4. The fiber cells of plants are a type of a. parenchyma. d. meristematic cell. b. sclerenchyma. e. phloem cell. c. collenchyma.