Botany-Passive Transport Answers Essay Example for Free

Botany-Passive Transport Answers EssaySubstances necessary for normal growth and development of plants must continually be transported into jail cells piece metabolic wastes must be eliminated so that they wont accumulate inside the cells. For instance, wet as well as mineral brininesss from the soil solution drop root cells while carbon dioxide and oxygen through tiny pores known as stomata in leaves and lenticels in stem. Excess oxygen not utilized during cell respiration as well as oxygen produced during photosynthesis is released to the atmosphere. In most cases, movement of these substances is along a tautness gradient, that is, from regions of greater concentration to regions of less concentration. much(prenominal) type of transport is known as passive transport.Diffusion is a type of transport which is concerned with the movement of solute particles. Aside from concentration gradient, factors affecting the respect of diffusion include the temperature, size of dif fusing molecules and presence of other molecules aside from the diffusing one. Osmosis, on the other hand, is another type of passive transport, which is involved in the movement of solvent (e.g. urine) through a semi-permeable membrane. In osmosis, the presence of a differentially permeable membrane as well as differences in the concentration of the medium and the intracellular substance (i.e. cell sap) are factors to consider in determining the direction of water flow. (madel, dito gawa k ng visuals na puede,.. kung aong maisip mo di ko nga alam kung ano puede ndin ilgay . Ano kaya gagamitin ntin? Naka-acetate oh sa manila paper kaw n bhala..)Now the walls of these cells are made of a stuff a bit like a really fine veiling that get out let water through but not salt (a partially permiable membrane). Now water and salt prefer being mixed together than seperated, and water will move through the cell wall towards whichever side is the saltiest, this is called osmosis.This means t hat because outside is saltier the water leaves the cells, so the cells empty, and like a half adequate bag of water, go all floppy so the whole lettuce leaf goes floppyNow if you put the leaf in fresh water in that location are more salts in the leaf than in the water, so water will move back into the cells making them blow up like balloons again and become all strong and rigid.So if you have some old limp Lettuce soaking it in water for a while for a while will make it go crisp again.-The leaf in the salt water would be exsiccated, as its internal osmotic pressure would make water from the leaf seep through the cellular membranes. -its osmosis. the cells in the leaf are permeable to water but not salt,so if you immerse the leaf in salt water the cell will absorb water trying to balance the osmotic pressure .if you put the leaf in fresh water the cells will dump water,the salt water will cause the cells to absorb too much water and they will burst,the fresh water leaf will dehy drate and wrinkle,i think i got it right but dont quote me. -Your talking about tonicity, the salt solution is hypertonic and would pull fluid from the plasmodesmata in the plant cellsthe excess water being relatively isotonic would have little loss of fluid depending on where you live in the country and if you used tap water or bottled. Its the same concept of cellular dehydration and water toxicity in human cells.