Biology
Biology
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In our eReader you can find the full English version of the book. Read Biology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Biology
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The ordinary fern plant is the asexual generation, i. E. , it does not form the sex cells but, like the hydroid, it gives rise without fertilization to an organism different from itself. These dissimilar organisms are formed 120 PLANTS, THE FOOD OF ANIMALS FIG. 49. -Development of a fern (Aspidium) sporangium, a, The young spor- angium-forming cell just divided from its parent epidermis cell; b, c, d, e, f, different aspects of the dividing cells of the spore capsule; g, origin of the tapetal c...ells and formation of the spore-producing cell or archesporium (ar) ; h, increase of the tapetal cells (/) and formation of the spore mother cells; i, j, k, further stages in the development of the sporangium; an, annulus; pd, pedicel. (From Sedgwick and Wilson. ) REPRODUCTION OF THE FERN 121 from spores which develop on the under surfaces of the leaves. In nature sporulation of Pteris usually occurs in August and in allied forms sometime during the summer months. The margins of the mature leaves of Pteris when ready for spore formation turn under and form elongated pockets which extend throughout the length of the pinnules.
What to read after Biology?
You can find similar books in the "Read Also" column, or choose other free books by Gary N Gary Nathan Calkins to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The ordinary fern plant is the asexual generation, i. E. , it does not form the sex cells but, like the hydroid, it gives rise without fertilization to an organism different from itself. These dissimilar organisms are formed 120 PLANTS, THE FOOD OF ANIMALS FIG. 49. -Development of a fern (Aspidium) sporangium, a, The young spor- angium-forming cell just divided from its parent epidermis cell; b, c, d, e, f, different aspects of the dividing cells of the spore capsule; g, origin of the tapetal c...ells and formation of the spore-producing cell or archesporium (ar) ; h, increase of the tapetal cells (/) and formation of the spore mother cells; i, j, k, further stages in the development of the sporangium; an, annulus; pd, pedicel. (From Sedgwick and Wilson. ) REPRODUCTION OF THE FERN 121 from spores which develop on the under surfaces of the leaves. In nature sporulation of Pteris usually occurs in August and in allied forms sometime during the summer months. The margins of the mature leaves of Pteris when ready for spore formation turn under and form elongated pockets which extend throughout the length of the pinnules.
What to read after Biology?
You can find similar books in the "Read Also" column, or choose other free books by Gary N Gary Nathan Calkins to read onlineMoreLess
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