. College botany; structure, physiology and economics of plants. Botany. 162 COLLEGE BOTANY membrane is permeable to both tbe solvent and the dissolved .substance, there is always of both water molecules and solute molecules through the membrane. But if the mem- . brane is semi-permeable the solvent only is iuvolved. Plant membranes are usually permeable to soime solutes and imperme^ able to others. If in an open container the denser solution vsdll increase in volume and if in a closed con- tainer it will exert a very strong pres- sure (see Turgor, page 165)-. Demonstration of Osmoti
. College botany; structure, physiology and economics of plants. Botany. 162 COLLEGE BOTANY membrane is permeable to both tbe solvent and the dissolved .substance, there is always of both water molecules and solute molecules through the membrane. But if the mem- . brane is semi-permeable the solvent only is iuvolved. Plant membranes are usually permeable to soime solutes and imperme^ able to others. If in an open container the denser solution vsdll increase in volume and if in a closed con- tainer it will exert a very strong pres- sure (see Turgor, page 165)-. Demonstration of Osmotic Pressure.— This phenomenon is very easily demon- strated by soaking a semi-permeable mem- brane, such as an ani- mal bladder or parch- vment, in water and ty- —Apparatus for demonstrating osmosis; thistle ^^S ^^ °''^®^ ™® large tube on left and egg on riglit. ^ p \ * i_i j. i -K, end 01 a thistle tube by means of a wa:xed thread. The biilb part of the thistle 1 tube .is filled with a thick sugar solution and is then placed in a glass jar of distilled water so that the two liquids will be at the same level. The liquid in the thistle tube will rise to considerable height due to the passage of water through the membrane (Fig. 96). I ; Osmosis and Diffusion in the Living Plant.—In the living. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cook, Melville Thurston, 1869-1952. Philadelphia and London, J. B. Lippincott Company
Size: 1442px × 1733px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
