. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 68 BOTANY may be planted from five to ten times their own depth. Keep ths tem- perature as near 75° Fahrenheit as possible. Protect at night from sudden drops in temperature by careful covering of the young plants. Water regularly and moderately. If the material for class work is ready at cer- tain stages before time to use in the laboratory, the specimens may be placed in 4 per cent formol solution until needed. After the different plants have appeared above ground a daily record should be
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 68 BOTANY may be planted from five to ten times their own depth. Keep ths tem- perature as near 75° Fahrenheit as possible. Protect at night from sudden drops in temperature by careful covering of the young plants. Water regularly and moderately. If the material for class work is ready at cer- tain stages before time to use in the laboratory, the specimens may be placed in 4 per cent formol solution until needed. After the different plants have appeared above ground a daily record should be made of at least one of each kind of seed or grain planted. ]Note the length of time it took each to appear above the ground and make daily drawings until the young plants. Sprouting beans. Note the arch in the hypocotyl. in its growth ? How is this of ';^e to the plan* are at least two weeks old. At the end of that time an entire plant of bean, pea, and corn should be removed and drawn. You will thus accurately determine the fate of each part of the growing plant. Answer the following questions from bean seedlings grown at home or from material supplied you in the laboratory. Which part of the embryo breaks through the seed coats first and at what point does it appear ? In what direction does the hypocotyl grow? Does it always take this direction? How does the seedling break through the ground? Which part appears first above ground? Why does it assume this position? Are the cotyle- dons pushed or pulled out of the ground ? What color has the plant above ground? What becomes of the cotyledons in old specimens? Pleasure the cotyledons in a young specimen and then again when the plant has grown older. Do they grow in size? Make a table which shows the ultimate fate in a bean seedhng of the following parts- cotyledons, hypocotyl, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
Size: 1709px × 1462px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookpublishernewyorkamericanbookcompany, booksubjectbiology
