. Science of plant life, a high school botany treating of the plant and its relation to the environment. Botany. Figs. 15 and 16. Upper and lower epidermis of vinca leaf. plant. The foods pass from the mesophyll cells into this food-conducting tissue, and then down through the petiole of the leaf to the living cells of the stem and roots. In the smaller veins the bimdle sheath is a layer of meso- phyll cells. In the larger veins it contains one or more layers of thick-walled cells, which act as a mechanical or supporting tissue. The mechanical tissue is rigid and gives stiffness to the leaf. C
. Science of plant life, a high school botany treating of the plant and its relation to the environment. Botany. Figs. 15 and 16. Upper and lower epidermis of vinca leaf. plant. The foods pass from the mesophyll cells into this food-conducting tissue, and then down through the petiole of the leaf to the living cells of the stem and roots. In the smaller veins the bimdle sheath is a layer of meso- phyll cells. In the larger veins it contains one or more layers of thick-walled cells, which act as a mechanical or supporting tissue. The mechanical tissue is rigid and gives stiffness to the leaf. Cells, tissues, and organs. We see, then, that the actual work of the plant is done in its cells, of which there are many millions, and it is the sum of the hfe and work of all these cells that makes up the Hfe and work of the plant as a whole. All cells carry on certain fundamental Hfe processes like respiration and the assimilation of food, but most cells are especially adapted to some particular work that is carried on for the benefit of the plant as a whole. Cells that have the same special function are similar in structure and are generaUy. 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 Transeau, Edgar Nelson, 1875-1960. Yonkers-on-Hudson, N. Y. , World Book Co.
Size: 1376px × 1815px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1921
