Phloem and Principal Water-conducting Elements

Exercise 4 (Histology) 1. 1 Give at smallest three distinguishing features of these groups of cells. Apical meristems entertain the forthcoming features: (1) a “border” of cells; (2) they prosper direct or shape; and (3) some cells are darker (indicating that they rafter mitosis). 2. 1 Confirm the web. The web is a vascular cambium. 4. 5 (? ) Is the epidermis uniseriate or multiseriate? In the peevish exception of a girlish commencement of Helianthus, the epidermis is uniseriate. 6. 1 What do you seduce the outgrowths of the epidermis? These are seduceed trichomes. 6. 2 What is their office? They office chiefly for aid and refuge of the leaf or parent which contains the epidermis. 6. 3 Classify the types of epidermal outgrowths in the aloft plants. bristle| lamina| single hair| glandular| divergence| stellate| 7. 1 Draw and confirm the tracheary elements. reticulate| annular| scooped| scalariform| helical| 8. 1 Differentiate the sieve tubes from the mate cells. The sieve tubes in the phloem are composed of crave, niggardly cells which bankruptcy a center, ribosomes, and some other cellular components; they enravishment sugars and other fundamental nutrients. Companion cells entertain nuclei and ribosomes that to-boot work-for the sieve-tube cells but do not themselves grasp portio in conduction. 8. 2 What are the main water-conducting elements of the xylem? The two main water-conducting elements of the xylem are the tracheids and the vessel elements. 9. (Table 4. 1) Specimen| Tissue| Cell Types| Characteristic(s)| Function(s)| Cassava gist| | | | | Tomato production pulp| | | | | Spanish pine petiole| | | | | Lotus peduncle| | | | | Celery petiole| | | | | Coleus petiole| | | | | Mung bean origin wheedle| | | | | Peanut pericarp| | | | | Pineapple leaf| | | | | Others| | | | |