. Lessons in botany. Botany. CHAPTER XVI. RESPIRATION. Exercise 33. 166. Simple experiment to demonstrate the evolution of C0a during germination.—Where there are a number of students and a number of large cylinders are not at hand, take bottles of a pint capacity, place in the bottom some peas soaked for 12 to 24. hours. Cover with a glass plate which has been smeared with vaseline to make a tight joint with the mouth of the bottle. Set aside in. a moderately warm place for 24 hours. Then slide the glass plate a little to one side and quickly pour in a little baryta water so • that it will ru
. Lessons in botany. Botany. CHAPTER XVI. RESPIRATION. Exercise 33. 166. Simple experiment to demonstrate the evolution of C0a during germination.—Where there are a number of students and a number of large cylinders are not at hand, take bottles of a pint capacity, place in the bottom some peas soaked for 12 to 24. hours. Cover with a glass plate which has been smeared with vaseline to make a tight joint with the mouth of the bottle. Set aside in. a moderately warm place for 24 hours. Then slide the glass plate a little to one side and quickly pour in a little baryta water so • that it will run down on the inside of the bottle. Cover the bottle again. Note the precipitate of barium carbonate which demonstrates the presence of in the bottle. Lower a lighted taper. It is extinguished because of the great quantity of COa. Exercise 34. 167. Comparison of respiration in plants and ani- mals—Take some of the baryta water and breathe upon it. The same film is formed. The carbon diox- ide which we exhale is absorbed by the baryta water and forms barium carbonate, just as in the case of the peas. In the case of animals the process by which (Sacl>s.) oxygen is taken into the body and carbon dioxide is given off is respiration. The process in plants which we are now studying is the same, and also is respiration. The oxygen in the vessel was partly used up in the process and carbon dioxide was given off. (It will be seen that this process is exactly the opposite of that which takes place in starch formation.) Exercise 35 (or Demonstration). 168. Respiration is necessary for growth.—After we have performed the experiment in paragraph 166, if the vessel has not been open too long so 94. Fig. 72. Test for presence of carbon dioxide in vessel with germinating 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 th
Size: 1177px × 2123px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisher, booksubjectbotany
