Phloem

0708-AS Biology Revision Top Priority Questions AS BIOLOGY TOP 60 QUESTIONS Chapter 1 1- Fig.1.1 is an electron micrograph of a mesophyll cell from a leaf. 1.5μm Fig.1.1 (a) Calculate the magnification of Fig.1.1. Show your working and express your answer to the nearest whole number. (b) Identify, by using the letters A to D, a part of the cell shown in Fig. 1.1 where the following substances are located. A chlorophyll B cellulose C DNA D phospholipid (c) State three ways in which the structure

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Within each vein, the xylem can be seen on top of the phloem. (ASBiology101, 2013). Xylem tissue consists of the xylem vessels to transport water and dissolved minerals; fibres to help support the plant and cells. These are long cells with thick walls impregnated with lignin (see appendix). “Lignin in the

(5 pts) 1. Describe the pressure-flow model of translocation in the phloem. Does water move down its water potential gradient in this model? (4-5 sentences max.) The flow is driven by an osmotically generated pressure gradient between the source and the sink. The translocation pathway has cross walls that allow water to move between the xylem and phloem. At the source phloem loading causes high solute concentrations. Pressure decreases, so water flows into the cells increasing pressure. At the

Journal #5 In all his adventures, McCandless possessed little to nothing in possessions and subsistence, but that didn’t stop him from doing achieving his goals. Likewise, the American dream or character stands on the same foundation of success where anyone can gain wealth and happiness even if they start from nothing. Though McCandless was privileged with a comfortable life, he intentionally threw everything away like his college money and car to prove he could continue without having a head start

TOMATO PLANT 1) Seed: Tomato seeds are small, flat and disk shaped and about 1/8 inch wide. They contain two energy storage organs called cotyledons and an embryo encased in a hard outer shell called the seed coat. The seed is the dormant or resting stage of the plant life cycle. When young tomato plants are damaged, they tend to go into a dormant, survival stage in which plant growth is delayed for a while. Frost damage is something to look out for when planting tomatoes early on in the season

Compare and contrast xylem tissue and phloem tissue, including their respective structures and functions. The stems and roots of plants contain two separate transport systems; xylem vessels and phloem tubes, of which neither transport oxygen as it is transported to cells by diffusion. The network of xylem vessels transports water and mineral ions from the roots to all other parts of the plant whereas phloem tubes transport food made in the leaves to all other parts of the plant. In the stems

Rachael Goodson Paper Discussion #2, Spring 2018 Summary of Cocletzi Paper This paper was about the bidirectional anatomical effects of mistletoe-host the sweet gum tree (L. styraciflua) and the Mexican royal oak (Q. germana). The main reason that the researchers wanted to do this study was because while multiple studies have been completed on how a parasite effects the host little has been done to study the effect of the host on the

In the callus differentiation gives rise to the two major types of plant vascular tissue xylem and phloem. Xylem is responsible for keeping the plant hydrated and can normally be fond towards the center of the plant. All Xylem cells are dead, elongated and hollow. The two types of Xylem cells are tracheids and vessel elements. Tracheids are found in

cross-sections demonstrated the basic differences that distinguish a monocot plant for a dicot plant. When looking at the cross-section of the monocot stem you can see that the vascular bundles are scattered. These vascular bundles consist of only a phloem and xylem. The phloem is responsible for transporting soluble compounds (food) created by photosynthesis, to the rest of the plant, especially where they are needed. The xylem is important for the movement of water throughout the plant. Another difference that