A seed plant or spermatophyte (lit. ' seed plant '; from Ancient Greek σπέρματος (spérmatos) 'seed' and φυτόν (phytón) 'plant'), also known as a phanerogam (taxon Phanerogamae) or a phaenogam (taxon Phaenogamae), is any plant that produces seeds.

Seed plant, any of the more than 300,000 species of seed-bearing vascular plants. Although the taxonomic division Spermatophyta is no longer accepted, the term ‘spermatophyte’ is used to refer collectively to the angiosperms and gymnosperms.

Seed plants are a group of plants. Gymnosperms and angiosperms form the group. Their seeds have three parts: (1) an embryo, (2) a supply of nutrients for the embryo, and (3) a seed coat. They are also called spermatophytes or phanerogams. The seed plants dominate almost all the environments on land. The living spermatophytes are in five groups:

2025年1月2日 · seed, the characteristic reproductive body of both angiosperms (flowering plants) and gymnosperms (e.g., conifers, cycads, and ginkgos). Essentially, a seed consists of a miniature undeveloped plant (the embryo), which, alone or in the company of stored food for its early development after germination , is surrounded by a protective coat (the ...

2023年8月3日 · A seed is the fertilized matured ovule that possesses an embryonic plant, stored food material, and a protective coat that is viable and can germinate.

Seed plants appeared about one million years ago, during the Carboniferous period. Two major innovations—seed and pollen—allowed seed plants to reproduce in the absence of water. The gametophytes of seed plants shrank, while the sporophytes became prominent structures and the diploid stage became the longest phase of the lifecycle.

The seed plants. The spermatophytes, which means "seed plants", are some of the most important organisms on Earth. Life on land as we know it is shaped largely by the activities of seed plants. Soils, forests, and food are three of the most apparent products of this group.

2021年4月2日 · Most seeds consist of three parts: embryo, endosperm, and seed coat. The embryo is a tiny plant that has a root, a stem, and one or more leaves. The endosperm is the nutritive tissue of the seed, often a combination of starch, oil, and protein. The seed coat is a protective covering that can help seeds remain viable for long periods of time.

Seed plants are called spermatophytes. The evolution of seeds by vascular plants was a very big deal. In fact, it was arguably as important as the evolution of vascular tissues. Seeds solved the problem of releasing offspring into a dry world. Once seeds evolved, vascular seed plants and their descendants diversified to fill terrestrial niches ...

There are two main subdivisions of seed plants—the ones without covered seeds, the gymnosperms, and the ones with covered seeds, the angiosperms. In this tutorial, we will briefly look at both types of plants.