. A civic biology : presented in problems. Biology; Sanitation. A root system, showing primary and secondary roots. age of food, climbing, etc. All functions other than the first one stated arise after the young plant has begun to develop. Root System. - - If you dig up a young bean seedling and carefully wash the dirt from the roots, you will see that a long root is devel- oped as a continuation of the hy- pocotyl. This root is called the primary root. Other smaller roots which grow from the primary root are called secondary, or tertiary, depending on their relation to the first root develope
. A civic biology : presented in problems. Biology; Sanitation. A root system, showing primary and secondary roots. age of food, climbing, etc. All functions other than the first one stated arise after the young plant has begun to develop. Root System. - - If you dig up a young bean seedling and carefully wash the dirt from the roots, you will see that a long root is devel- oped as a continuation of the hy- pocotyl. This root is called the primary root. Other smaller roots which grow from the primary root are called secondary, or tertiary, depending on their relation to the first root developed. Downward Growth of Root. Influence of Gravity. - - Most of the roots examined take a more or less downward direction. We are all familiar with the fact that the force we call gravity influences life upon this earth to a great degree. Does gravity act on the growing root? This question may be answered by a simple experiment. Plant mustard or radish seeds in a pocket garden, place it on one edge and allow the seeds to germinate until the root has grown to a length of about half an inch. Then turn it at right angles to the first position and allow it to remain for one day undisturbed. The roots now will be found to have turned in response to the change in position, that part of the root near the growing point being the most sensitive to the change. This ex- periment seems to indicate that the roots are influenced to grow downward by the force of Revolve this figure in the direc- tion of the arrows to see if the roots of the radish re- spond to Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George W. (George William), 1873-1948. New York : American Book Company
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