Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] Make a series of at least three drawings of the developing seedling to show the growth of the various organs In this series draw a line across your paper to show the level of the ground. Problems cf Growth' — There are several interesting problems concerning the growth of the bean seedling. Most of these questions we can solve with the aid of simple experiments. These experiments may bo allotted to different meml)ers of the class to
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] Make a series of at least three drawings of the developing seedling to show the growth of the various organs In this series draw a line across your paper to show the level of the ground. Problems cf Growth' — There are several interesting problems concerning the growth of the bean seedling. Most of these questions we can solve with the aid of simple experiments. These experiments may bo allotted to different meml)ers of the class to perform at home and bring to school when the laboratory work of the bean seedling is finished and the pupils are ready for a discus- si of its growth. The following experiment should be started at once. Experiment. — What is the func- tion oj the cotyledons of the bean? Plant six beans in sawdust. After they have grown so that the hypo- cotyls are above the surface, re- move the cotyledons from three beans. Watch the growth of both lots very carefully, making sure that they are exposed to exactly the same conditions of heat, mois- ture, light, and air. After two weeks draw a bean from each lot. Of what use to the growing plant are the cotyledons? Why?^ 'mm Bean seedlings. Note that in the older seed- lings to the left the cotyledons have been almost entirely used up. Germination. — All the stages passed through by the youjig plant, from the time the seed begins to sprout until it can take care oj itself by means of its roots and leaves, are known as the stages of germinatioii. The young plant ceases to be a seedling after it has lost its seed leaves or cotyledons. A comparison of the Pea and Bean. — Suggestions for laboratory work. Compare the markings on the outside of the pea with those you found on the bean. Make a diagram of the pea drawn from the hilum end. Show the following structures neatly labeled : hilum, micropyle, strophiole. Open a soaked seed. How
Size: 1648px × 1213px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
