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Some herbaceous dicots and monocots have contractile

roots that pull the plant deeper into the soil. Many lily bulbs

are pulled a little deeper into the soil each year as new sets

of contractile roots are developed (Fig. 5.13). The bulbs

continue to be pulled down until an area of relatively stable

temperatures is reached. Plants such as dandelions always

seem to have the leaves coming out of the ground as the top

of the stem is pulled down a small amount each year when

the root contracts. The contractile part of the root may lose

as much as two-thirds of its length within a few weeks as

stored food is used and the cortex collapses.

Figure

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