. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Fig. potato tuber giving rise to new tubers. thickened root. Even in the North, this thickroot develops. It would appear that these thick-ened parts develop in plants because of the en-vironments in which the plants grow; that is,they seem to be adaptations. 458a. A forcible illustration of the fact that bulbs, conns,tubers, and the like are storehouses of plant-food is suggested byFig. 384. This represents an old potato tuber (a), from whichnew tubers have grown, while it was still i
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Fig. potato tuber giving rise to new tubers. thickened root. Even in the North, this thickroot develops. It would appear that these thick-ened parts develop in plants because of the en-vironments in which the plants grow; that is,they seem to be adaptations. 458a. A forcible illustration of the fact that bulbs, conns,tubers, and the like are storehouses of plant-food is suggested byFig. 384. This represents an old potato tuber (a), from whichnew tubers have grown, while it was still in the bin. This is a 366 LUSSOSS WITS PLANTS- frequent occurrence in potato bins in which there are tubers a yearor so old. The tuber endeavors to grow, but finding neither lightnor soil, it makes new tubers out of its own Pig. 385. Section of a hill of potatoes growing in clay soil, drawn from old or seed tuber is at A. Suggestions.—Let the pupil answer some or all of the follow-ing questions concerning a hill of potatoes. The queries may allbe answered easily by appealing to the growing plants, and someof them may be answered from potatoes in the bin. How earlyin the life of the plant do the tubers begin to form? Do thetubers grow above the roots or below them? Does the positionvary between hard and mellow soils? Are potatoes produced onrhizomes or roots? Do they form on the very end of the under-ground stalk? Does one stalk ever bear more than one tuber, — dotubers form sucoeBsively on a stalk, or does a stalk ever branch? SUXrifUBS AND LAYERS 367 Do these stalks increase in length or diameter after the tuber be-gins to form? From what part of the plant do these stalks spring?Is there ever a stem on both ends of a potato? From what pointdo the roots of a potato plant first spring,— fro
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
