Phloem and Principal Water-conducting Elements

Exercise 4 (Histology) 1. 1 empower at least three distinguishing features of these groups of cells. Apical meristems have the following features (1) a b crop of cells (2) they follow order or shape and (3) some cells are darker (indicating that they undergo mitosis). 2. 1 Identify the tissue. The tissue is a vascular cambium. 4. 5 (? ) Is the cuticle uniseriate or multiseriate? In the cross section of a young root of Helianthus, the epidermis is uniseriate. 6. 1 What do you call the outgrowths of the epidermis? These are called trichomes. 6. 2 What is their function?They function mainly for maintenance and protection of the leaf or stem which contains the epidermis. 6. 3 Classify the types of epidermal outgrowths in the above plants. rise scale simple hair glandular branching stellate 7. 1 Draw and identify the tracheary elements. reticular annular pitted scalariform helical 8. 1 Differentiate the sieve tubes from the companion cells. The sieve tubes in the phloem are composed o f long, narrow cells which lack a nucleus, ribosomes, and some former(a) cellular components they transport sugars and other organic nutrients.Companion cells have nuclei and ribosomes that also serve the sieve-tube cells but do not themselves take air division in conduction. 8. 2 What are the principal water-conducting elements of the xylem? The two principal water-conducting elements of the xylem are the tracheids and the vessel elements. 9. (Table 4. 1) Specimen tissue paper Cell Types Characteristic(s) Function(s) Cassava pith Tomato fruit pulp Spanish flag petiole genus Lotus peduncle Celery petiole Coleus petiole Mung bean seed coat goober pericarp Pineapple leaf Others