. Essentials of biology presented in problems. Biology. Experiment to show the function of the cotyledons of the pea, photographed at the end of two weeks. Note the size of the plants at the left, without cotyle- Cotyledons as Foliage Leaves. — In the young plants which we have just been studjang, the cotyledons hold a reserve food supph-, but do not serve at any time as true leaves for the plant. In many dicoty- ledons, however, the seed lea\es do act as true le;i\-es. This may well be seen in the squash seed- ling. Here the young plant has httle or no food stored in the cotyledons; it
. Essentials of biology presented in problems. Biology. Experiment to show the function of the cotyledons of the pea, photographed at the end of two weeks. Note the size of the plants at the left, without cotyle- Cotyledons as Foliage Leaves. — In the young plants which we have just been studjang, the cotyledons hold a reserve food supph-, but do not serve at any time as true leaves for the plant. In many dicoty- ledons, however, the seed lea\es do act as true le;i\-es. This may well be seen in the squash seed- ling. Here the young plant has httle or no food stored in the cotyledons; it must be prepared to take care of itself quickly. It does this by means of the rapidly growing coty- ledons, which soon unfold as true lea\es to the sun. In the seeds of the pea and bean we have found that the embrj-o takes up all the space within the seed coats. There are some dicotyledonous plants that ha\e food stored outside of the embryo. Such a plant is the castor bean. A section out vertically through the castor bean discloses * It must be remembered that this is not quite a fair test to the pea, because we take away from the young plant part of its own body. Arrangement of embryo in endosperm (Gray) : a, morning-gIor>'; 6, liarberrj'; c, potato ; fi, four- o' 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 William, 1873-1948. New York, Cincinnati [etc. ] American Book Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1911
