Phloem Essays

Water potential is often represented by the Greek letter, psi ψ .The higher the rate of collisions of the water molecules with the membrane, the greater the pressure on it. This pressure is called water potential. Water always moves from higher water potential to lower water potential. The standard unit for water potential is kilopascals (kPa), which is also the unit pressure. Pure water is designated a water potential of zero which has the highest water potential under atmospheric pressure at 25°C

transports the water and solutes from the roots to the leaves while phloem transports food from the leaves into the rest of the plant. The process of which the water evaporates from the leaves is called transpiration, which then results in more water being drawn up from the roots. Plants have two transport systems to move food, minerals and water through their roots, leaves and stems. They use continuous tubes in the systems and are called Phloem and Xylem, also known as vascular bundles. The xylem tubes

1) Plants have evolved many ways in which they can survive well on land. a) Identify three changes that had to occur for plants to move from a life mostly in water to a life on land. Three changes that had to occur for the plants to move from aquatic to terrestrial life are the following: Body support: In water, the plants are buoyant and the effect of gravity on them is minimal. The reason of developing rigid stem is to support the plants in a way that it can grow higher above the land. Further

1 Rhizosphere Interactions Jacob Griganavicius Robyn Dumalo Introduction Plants are the most important living organism on our planet today, without them; humans would most likely not be present on this planet. Plants are photoautotroph, which means they get energy from sunlight in order to change carbon dioxide (CO2) and water (H2O) into organic materials for all living organisms1 . The reason that plants are so important to humans is that they go through a main process to produce oxygen so

Parasites require resources gained from their hosts to stay alive and grow. Mistletoe is a type of parasite that establishes itself on trees and taps into the Xylem and Phloem of the tree to suck at its water and nutrients. In this study we examined the effect moister has on the abundance of the Mistletoe Phoradendron macrophyllum in the area of Wet Beaver Creek, Arizona. We took measurement of health tree diameter and species of 100 trees, 50 from a dry site and 50 from a site located along a perennial

Transpiration in Plants IA Aim Research question There are a many factors that affect the plant transpiration. To what extent can the independent variable wind affect the dependent variable water loss(Transpiration)? Hypothesis Plants lose a lot of water every single day and the process of losing this water is called transpiration, this happens when water evaporates through the tiny pores (invisible to the naked eye). This experiment will test the effect of change in independent variable

Introduction It’s a vegetable that doesn’t provide any nourishment, originally it was used to cure illness, and the first president of the United States, George Washington grew it.2 Today, an acre of tobacco can be sold for approximately thirty-five hundred dollars an acre, making it one of the most profitable crops to grow.2 Historically, tobacco played an important role in the founding of the United States, during the revolutionary war, Benjamin Franklin was able to secure a loan from France using

Over the past two decades the pine forests of Western North America have experienced major changes due to the Mountain Pine Beetle epidemic that began in 1995. Mountain Pine Beetles are insect parasites that use trees as their hosts in order to mate and lay eggs. After the larva becomes a beetle, the tree is killed and the next generation of beetles set out to find another pine tree and the cycle repeats. Environmentalists have proven the changes in the lifecycle of the pine beetle to be directly correlated

through the stoma. The chlorophyll additionally produce the chemical energy ATP and NADPH which are taken to the Calvin Cycle. This is where carbon dioxide and chemical energy produce glucose and cellulose (which serves as food for the plant; it exits phloem of the plant, located in the veins. As stated above, the thylakoid, chloroplast, chlorophyll, ATP, and NADPH are the cell parts involved in photosynthesis. Overall, this investigation proved to be successful because it demonstrated that different

Peristalsis is a natural process of area contraction and expansion along the length of the tube/channel. The peristaltic flows of Newtonian and non-Newtonian fluids have immense applications in physiology and industry. In physiology, many body parts such as stomach, gastrointestinal tract and small intestines are the common examples in which peristaltic waves appear. The peristaltic phenomenon has great importance in the movement of food bolus in the digestive system, chyme motion in the gastrointestinal

Sulphur is a yellowish, non-metallic chemical element in the periodic table. It is found in group 6 and period 3. Sulphur is identified by the letter S. Since Sulphur is the 16th Element of the periodic table therefore atomic number is always similar as the proton number which is located in the nucleus and converts the nucleus in to a positive charge as neutron is a neutral charge (+-) so positive (+) plus neutral (+-) equals a positive charge. The atomic mass for sulphur is 32 amu or (Atomic Mass

Introduction Sweet sorghum is an annual C4 plant having high concentration of sugars in stalks and can be used as a biofuel crop (Rooney et al., 2007). It can be grown successfully in semi-arid regions and known as the sugarcane of the desert. This plant can produce 45-65 t/ha stalk yield and 3-7 t/ha sugar yield in short duration with less water requirement like rain fed crops (Rao et al., 2013). Improvement in stalk yield and sugar accumulation is the major concern of sweet sorghum production.

Introduction Viruses are obligate intracellular parasites that are known to harm humans, animals, plants, and bacteria. It is for this reason that research is being devoted to their evolution in hosts. Virus evolution can be microevolution, which is small genetic changes in a population, or macroevolution, which is a large genetic change in a population that may lead to new virus species. Virus evolution is driven by natural selection and genetic drift. Natural selection involves mutations, and is