. Essentials of biology presented in problems. Biology. FRUITS AND THEIR USES 55 in the follicle of the milkweed, a fruit which siilits along the odge of one vaho, the pod or Ichkiiic of a pea and the Iw'an, and the aipsule of Junson weed and tho oxoning primrose. In all of the above, Iho ovary wall does not split opt'u until the seeds are fully ripe. This helps to insure the future growth of tho seed. Some dehiscent fruits scatter their seeds through tho explosion of the seed case. Such a fruit is the witch- hazel, which explodes with such force that the seeds arc tlu-o\\ai se\'eral feet. The
. Essentials of biology presented in problems. Biology. FRUITS AND THEIR USES 55 in the follicle of the milkweed, a fruit which siilits along the odge of one vaho, the pod or Ichkiiic of a pea and the Iw'an, and the aipsule of Junson weed and tho oxoning primrose. In all of the above, Iho ovary wall does not split opt'u until the seeds are fully ripe. This helps to insure the future growth of tho seed. Some dehiscent fruits scatter their seeds through tho explosion of the seed case. Such a fruit is the witch- hazel, which explodes with such force that the seeds arc tlu-o\\ai se\'eral feet. The \\ild geranium, a fl\-e-loculed capsule, spUts along the edge of each locule, snaps back, and throws the seed for some distance. Jewelweed fruits burst open in somewhat the same manner. /Ail Capsule of crane's- bill discharging its seed. f/fWinged —Tltc seeds of the pine, held underneatli the st'ales of the cone, are prolonged "inxo mngs, \\hich aid in their dispersal. The seeds of many of yjur trees are thus scattered. Other Methods^— Sometimes whole plants are carried by the high winds of the fall. This is effected in the plant,s called tumble- weeds, in which the plant body, as it dries, assumes a somewhat spherical shape. The main stalk breaks off, and the plant may then be blown along the ground, scattering seeds as it goes, until it is ultimatel}^ stopped by a fence or bush. A single plant of Russian thistle may thus scatter over two hundred thou- sand seeds. Seeds or fruits (for example, the coconut) may fall into the water and be carried thousands of miles to their new resting place, the fibrous husk provid- ing a boat in which the seed is earri(>(l. Otiier seeds may collect in the mud along tht- banks of ponds or streams. Birds which come there to feed upon these and other material iit the nmd may earr.\- nian\' seeds in tlH> nuid attached to their feet. The great Enghsh naturalist, Charles. Crosn section of a encount in its librous Please
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1911
