Tag Archives: Seed Plants

The Seed Plants: Dominant Forms Of The Earth’s Vegetation (Part 2)

Most of the plants you encounter in practically every sort of natural environment are seed plants, so-called because they reproduce by seeds. Botanists have been particularly interested in seed plants, not only because of their abundance, but also because of their diversity and usefulness to mankind. As a result, they have been studied more completely than any other plant group. So, let’s find out more! The Growth Process All seed plants obviously grow. The process of growth, which results in the formation of new tissues, occurs chiefly at the tips of roots and in the buds of stems. In many seed plants a growth tissue called cambium is located in stems and roots between the two conducting tissues: xylem (which conducts water and soil nutrients upward) and phloem (which conducts foods manufactured in leaves downward). The growth activity of cambium leads to the production of new tissues transversely (crosswise) in…

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The Seed Plants: Dominant Forms Of The Earth’s Vegetation

In almost every type of natural landscape, most of the plants you see belong to the group known as seed plants – so-called because they reproduce by means of seeds. There are more than 250, 000 known species in all –more than those of all the other plant groups put together. Botanists have been particularly interested in the seed plants not only because of their numbers but also because of their variety and their outstanding importance to man. As a result, they have been more thoroughly investigated than any other plant group. So, let’s learn more! Seed Plants The seed plants belong, according to a widely accepted classification, to the phylum Pteropsida. This includes not only seed-bearers but also the ferns, which do not have seeds. In another classification, the ferns and seed plants are grouped together with the club mosses and horsetails in a single phylum – the Tracheophyta.…

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