. Botany, an elementary text for schools. Botany. 84 THE MAJvING OF THE LIVING MATTER may be the water forced up by the roots; some of it is the condensed vapor of the air. 176. The wilting of a plant is due to the loss of water from the cells. The cell walls are soft, and collapse. A grain bag will not stand alone, but it will stand when filled with wheat. In the woody parts of the plant the cell walls may be stiff enough to support themselves, even though the cell is empty. Measure the contraction due to wilting and drying by tracing a fresh leaf, and then trac- ing the same leaf after it ha
. Botany, an elementary text for schools. Botany. 84 THE MAJvING OF THE LIVING MATTER may be the water forced up by the roots; some of it is the condensed vapor of the air. 176. The wilting of a plant is due to the loss of water from the cells. The cell walls are soft, and collapse. A grain bag will not stand alone, but it will stand when filled with wheat. In the woody parts of the plant the cell walls may be stiff enough to support themselves, even though the cell is empty. Measure the contraction due to wilting and drying by tracing a fresh leaf, and then trac- ing the same leaf after it has been dried between papers. The softer the leaf, the greater will be the contraction. Eeview.— Whence comes the food of plants? What is meant by the dry substance? What is charcoal? How is it obtained? How much of the dry substance is carbon? What becomes of it when the plant is burned in air? Whence comes the carbon? What is carbon dioxid? How abundant is it in the air? How does the CO2 get into the leaf? What is chlorophyll? What function has it? Where are the chlorophyll bodies located? What relation has light to chlorophyll? When is CO2 absorbed? What is formed after COo is taken in? Define photosynthesis. What is starch? What is given off when starch is made by photosynthesis? In what part of the plant is starch first made? When? What are carbohydrates ? What is digestion of starch? How is the digested food distributed? Explain assimilation. What is the product of assimilation? Explain respiration. When are O and CO2 given off? Define transpiration. Why do plants wilt?. An egg-shell f;irm for the pupil's 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York Macmillan
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