. Practical text-book of plant physiology. Plant physiology. RHEOTROPIC REACTIONS OF PLASMODIA 69 the gelatine and the plasmodium will be found to move to- ward 106. Rheotropic Reactions of Plasmodia. Secure specimens of Plasmodia growing on leaves or decaying wood as in 103 and bring into the laboratory with as little disturbance as possible. Lay the material on the bottom of a flat dish. Arrange a beaker of water near by, and place a strip of filter paper with one end in the water and the other brought over the side of the beaker and resting on the material near the plasmodium. The plas
. Practical text-book of plant physiology. Plant physiology. RHEOTROPIC REACTIONS OF PLASMODIA 69 the gelatine and the plasmodium will be found to move to- ward 106. Rheotropic Reactions of Plasmodia. Secure specimens of Plasmodia growing on leaves or decaying wood as in 103 and bring into the laboratory with as little disturbance as possible. Lay the material on the bottom of a flat dish. Arrange a beaker of water near by, and place a strip of filter paper with one end in the water and the other brought over the side of the beaker and resting on the material near the plasmodium. The plas- modium will be found to move toward and upward along the filter paper. It is attracted or stimulated by the current of water, and responds by moving against it. The mechanism by which this is accomplished is not easily explainable. The above test should be made in a dark room to avoid phototropic reactions. 107. Influence of Water and Water Va- por on Form. The long continued expo- sure of a species to a habitat rich in mois- ture, or to arid conditions will result in adaptations suitable to the endurance of these water relations. The change of a plant from a land to an aquatic habitat re- sults in finely divided or ribbon-shaped leaves, while the species living in arid re- FlG- 29- Leaves of Ra- , , , 1 r 1 • nunculus delphinifolius: W, gions may develop thick succulent foliage ^^ JmeT£d in ^ or other forms suited to the storage or water: L, growing from the- conservation of the limited water supply P°rt">n of &<= stem above the These outward changes inform are ac- ^^ AfterGoebel- companied by many internal adaptations. Many species are so elastic that they are capable of producing organs adapted to ex- treme conditions on the same individual. 108. Form and Structure of Organs in Water and Watery Vapor. Grow seedlings of corn for a week in a germinating dish and ascertain the average measurements of the root-hairs and 1 Ayers, H. Methods of study of the
Size: 1589px × 1572px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1901
