A Textbook of Elementary Biology

Cover A Textbook of Elementary Biology
A Textbook of Elementary Biology
R J Robert John Harvey Gibson
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Growth. Without the expenditure of energy no growth can take place, for growth is an increase in the bulk of the plant, usually accompanied by a temporary or permanent General Physiology of the Plant. 2 1 1 change of form. Growth is, of course, the result of active constructive metabolism, and as such involves an increase in the dry weight of the plant. We shall glance first at the general conditions cf growth, and then briefly summarise the phenomena of growth.
Conditions of growth. Growth can
... take place only in the living plant, the growth of unorganised substances being merely the result of accretion. Growth is, in the first place, due to expenditure of energy taking place under certain conditions of temperature. Again, an adequate food supply in the form of the substances essential to the nutrition of plants is necessary. Water more especially is of importance. In addition, however, to these general conditions, growth is modified by the ability of the protoplasm itself to assimilate and respire, i.

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