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Nicotine content is determined by the species, variety, and strain of tobacco; the
growing conditions, particularly soil and climate; the methods of culture and cure;
and the position on the plant from which the leaves are taken—lower leaves ...
Tropiduchidae, family of planthoppers in the insect order Homoptera.
characteristics and classification 8: 1042f tropism, response or orientation of a
plant or certain lower animals to a stimulus that acts with greater intensity from
one direction ...
In some plants there is internal phloem as well, and the bundle is then called
bicollateral. A third type, the concentric bundle, is amphivasal if the phloem is
entirely surrounded by xylem, or amphicribral if the xylem is surrounded by
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review