Inquiry Summary

The study of roots is aided by laboratories such as rhi-zotrons. The growth and distribution of roots are controlled by gravity, genetic differences, the stage of plant development, and properties of the soil. Plants compete for the soil's nutrients and water by producing many roots, permeating the soil, and growing roots in places different from those of other plants. The growth of roots is affected by the environment. Compared to older plants, a seedling allocates more resources to its root than its shoot.

How do you think an annual plant (one that lives less than a year) might allocate resources to its roots and shoots?

Summary What Roots For Plants

FIGURE 7.16

This stand of aspen is probably a clone of asexually reproducing organisms. This clone is adapted to its high-mountain, summer-drought environment. It produces leaves early in spring and apparently reproduces only asexually.

FIGURE 7.16

This stand of aspen is probably a clone of asexually reproducing organisms. This clone is adapted to its high-mountain, summer-drought environment. It produces leaves early in spring and apparently reproduces only asexually.

FIGURE 7.17

In mangroves, gases diffuse to submerged roots through modified roots that stick up in the air.

FIGURE 7.17

In mangroves, gases diffuse to submerged roots through modified roots that stick up in the air.

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