. Biology and man. Biology; Human beings. Ranunculus Potamogeton Sagittaxia LEAVES IN AIR AND IN WATER The deeper the leaves of the water crowfoot are submerged, the more divided up they are. For a given amount of tissue, finely divided leaves have a greater absorb- ing surface. Pondweeds and arrowheads bear broad leaves in the air and long ribbon-shaped leaves in the water water filling the soil spaces keeps the roots submerged too long. The roots of rice are fine and threadlike, exposing much surface through which an adequate supply of oxygen is obtained from the surrounding water. If the wa
. Biology and man. Biology; Human beings. Ranunculus Potamogeton Sagittaxia LEAVES IN AIR AND IN WATER The deeper the leaves of the water crowfoot are submerged, the more divided up they are. For a given amount of tissue, finely divided leaves have a greater absorb- ing surface. Pondweeds and arrowheads bear broad leaves in the air and long ribbon-shaped leaves in the water water filling the soil spaces keeps the roots submerged too long. The roots of rice are fine and threadlike, exposing much surface through which an adequate supply of oxygen is obtained from the surrounding water. If the water table is near the surface as after prolonged rains in the early summer, corn roots, for example, do not penetrate very far into the soil. Then if a drought follows, the crop suffers badly, for the shallow root- system cannot reach the lower water levels, and the plant quickly dries out. On the other hand, when the early summer is exceptionally dry, the young roots grow deeper, so that a prolonged drought later in the season is not so destructive. Alfalfa will not thrive in a soil that is not well drained, for the roots "drown". Plants growing in swamps, where the level of the water is rather con- stant, have shallow root-systems; and they breathe through the portions that extend above the water. 203. 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 Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson Eldred), 1901-. Boston, New York, [etc. ] Ginn and company
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