. Impianto studi; un elementare botanica. La botanica. THALLOPHYTES : ALGiE 227 A-x- B O-"' plex vegetali sono costituiti da molte cellule. È necessario conoscere qualcosa della vita ordinaria cellula vegetale prima di corpi di alghe o di qualsiasi altra pianta corpi possono essere sotto- si fermò. Una tale cella se il libero è di forma approssimativamente sferica in profilo (Fig. 204), ma se premuti dalla celle contigue possono essere- venire variamente modificati in forma (Fig. 200). Di delimitazione di esso vi è una sottile parete elastica, composto da un sub- posizione chiamato cellulosa. La parete cellulare, quindi, forma un delicato sac, che contiene la vita substa

• Collaboratore: The Book Worm / Alamy Foto Stock
• ID dell’immagine: RE1JTR
• Dimensioni dei file: 7,2 MB (380,5 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 1242 x 2013 px | 21 x 34,1 cm | 8,3 x 13,4 inches | 150dpi

Altre informazioni

Questa foto è un'immagine di pubblico dominio, il che significa che il copyright è scaduto o che il titolare del copyright ha rinunciato a tale diritto. Alamy addebita un costo per l'accesso alla copia ad alta risoluzione dell'immagine.

Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.

. Plant studies; an elementary botany. Botany. THALLOPHYTES : ALGiE 227 A-x- B O-"' plex plants consist of very many cells. It is necessary to know something of the ordinary living plant cell before the bodies of Algae or any other plant bodies can be under- stood. Such a cell if free is approximately spherical in outline (Fig. 204), but if pressed upon by contiguous cells may be- come variously modified in form (Fig. 200). Bounding it there is a thin, elastic wall, composed of a sub- stance called cellulose. The cell wall, therefore, forms a delicate sac, which contains the living substance known as protoplasm. This is the substance which manifests life, and is the only sub- stance in the plant which is alive. It is the proto- plasm which has organized the cellulose wall about it- self, and which does all the plant work. It is a fluid substance which varies much in its consistence, sometimes being a thin viscous fluid, like the white of an egg, some- times much more dense and compactly organized. The protoplasm of the cell is organized into various structures which are called organs of the cell, each organ having one or more special functions. One of the most con- spicuous organs of the living cell is the single nucleus, a com- paratively compact and usually spherical protoplasmic body, and generally centrally placed within the cell (Fig. 200). All about the nucleus, and filling up the general cavity within the cell wall, is an organized mass of much thinner protoplasm, known as cytoplasm. The cytoplasm seems to form the general background or matrix of the cell, and the. Fig. 200. Cells from a moss leaf, showing nucleus (B) in which there is a nucle- olus, cytoplasm (C), and chloroplasts (A).—Caldwell.. 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 work.. Coulter, John Merle, 1851-1928. New Yo

Parole chiave associate all'immagine

• bookauthorcou
• bookcentury1900
• bookdecade1900
• booksubjectbotany