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From the practical standpoint of agriculture the symbiotic nitrogen-fixing
Bacteria are of first Importance. It will be recalled that these Bacteria form small
nodules on the rootlets of higher plants, such as Beans and Clover, and make
atmospheric nitrogen available to the latter-return it to the cycle of the elements in
living nature. Still another type of association in which both partners profit is
represented by the relation that occurs between Ants and Plant Lice, or Aphides.
The defenseless Aphides are protected, herded and milked by the Ants to supply
their demand for honeydew, a secretion of the Aphids which the Ants greedily
devour.
II. Remember the following words, consult a dictionary about the way they are
pronounced:
symbiosis (pl. symbioses) симбиоз
symbiotic симбиозный
abode жилище
lichen лишайник
algae (sing, alga) морская водоросль
rocky скалистый, каменистый
devastate опустошать, разорять
nodule узелок
rootlet корешок
bean боб
clover клевер
lice (pl.от louse) вши
aphides (pl. от aphis) тля
herd пасти
to milk доить
honeydew медвяная роса
devour пожирать
III. Suggest the Russian for:
the raw materials of food; to be at somebody's disposal; to make something
available; to cope with ...; to supply the demand for ...; to be confined to ...; to
owe something to...; intimate associations; to be of first importance; cooperative
adaptations.
IV. Suggest the English for:
живая природа; бесцветные растения; тот же вид; одноклеточные растения;
атмосферный азот; за счет другого; с точки зрения сельского хозяйства;
взаимовыгодный.
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