. Botany, with agricultural applications. Botany. 342 THALLOPHYTES. Many of the Bacteria are provided with cilia or terminal flagella, which enable them to move about independently. The ciUa are distributed over the body in various ways and are extremely difficult to detect. Some of the motile forms are quite active and motiUty is one of the fea- tures suggesting that Bacteria are animals. Their cell walls are more or less slimy, and their protoplasm is not definitely or- ganized into nucleus and cyto- plasm. These features with their power of resistance suggest a relationship with the Blue- g

. Botany, with agricultural applications. Botany. 342 THALLOPHYTES. Many of the Bacteria are provided with cilia or terminal flagella, which enable them to move about independently. The ciUa are distributed over the body in various ways and are extremely difficult to detect. Some of the motile forms are quite active and motiUty is one of the fea- tures suggesting that Bacteria are animals. Their cell walls are more or less slimy, and their protoplasm is not definitely or- ganized into nucleus and cyto- plasm. These features with their power of resistance suggest a relationship with the Blue- g Stock Photo
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The Book Worm / Alamy Stock Photo

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RDWD8B

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1606 x 1556 px | 27.2 x 26.3 cm | 10.7 x 10.4 inches | 150dpi

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. Botany, with agricultural applications. Botany. 342 THALLOPHYTES. Many of the Bacteria are provided with cilia or terminal flagella, which enable them to move about independently. The ciUa are distributed over the body in various ways and are extremely difficult to detect. Some of the motile forms are quite active and motiUty is one of the fea- tures suggesting that Bacteria are animals. Their cell walls are more or less slimy, and their protoplasm is not definitely or- ganized into nucleus and cyto- plasm. These features with their power of resistance suggest a relationship with the Blue- green Algae. They possess no chlorophyll and are almost ex- clusively parasites or sapro- phytes. The ability of the protoplasm to endure extreme cold, high temperatures, and drying even surpasses that of the Blue-green Algae. Besides remaining separate or forming filaments, Bacteria commonly have another stage in which numer- ous individuals are held together in masses or colonies by a matrix of gelatinous substance formed from their walls. This stage is known as the zoogloea stage {Fig. 296). These colonies form the characteristic pellicles on nutrient media, as on the water in which hay. Beans, Peas, or other organic substances are decay- ing, and on bouillon and various solid media {Fig. 297). When food is scarce or other conditions unfavorable, some forms shrink their protoplasm and enclose it in an inner heavy wall, thus form- ing what is called a spore. Enclosed in this heavy wall, they are inactive and extremely resistant to cold, heat, and drying. When transferred by wind or other agents to a suitable medium, they shed the'Tieavy wall and become active again. Their method of getting food is essentially the same as in the Myxomycetes. Since they live on or within the food supply, they are ia direct contact with the food material, and have only to change it to a soluble form and absorb it through their walls. They secrete enzymes which change insoluble foods to soluble Fi

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