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Course Of Growth And Development: A deficiency course of growth and development growth hormone during infancy results in the development course of growth and development a dwarf; these individuals are not deformed and are normal in intelligence and sexual development. An excessive production course of growth and development growth hormone during infancy or childhood will lead to the development course of growth and development a giant. When growth hormone begins to be produced in excessive quantities after normal growth has stopped, only the hands, feet, and chin enlarge; this condition is known as acromegaly (q. v.).
The second revolutionary advance in developmental plant biology was one made by botanists themselves. It was the discovery course of growth and development several new plant hormones, substances which regulate the growth and development course of growth and development plants. For almost 30 years after its discovery as a plant hormone in 1926, auxin had been regarded as the substance that could account for nearly all the phenomena course of growth and development plant growth and development in which hormone action was involved.
Lateral growth in trees frequently begins later than growth in height, but the period course of growth and development lateral growth is longer. Rates course of growth and development lateral growth likewise are low at the outset, increasing after a few weeks and then diminishing. In view course of growth and development the long annual period course of growth and development lateral growth in trees, deleterious environmental conditions may exercise a pronounced effect on growth. In the wood course of growth and development trees course of growth and development temperate regions, narrow and wide growth rings may be observed, marking years characterized by unfavorable and favorable conditions for growth. |
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