The most basic division of modern plants is between nonvascular and vascular plants. Modern nonvascular plants are called bryophytes. There are about 17,000 bryophyte species. They include liverworts, hornworts, and mosses, which are the most numerous group of bryophytes. Most bryophytes are small. They lack not only vascular tissues but also true roots, leaves, seeds, and flowers. Bryophytes live in moist habitats. Without the adaptations of vascular plants, bryophytes are not very good at absorbing water. They also need water to reproduce. Modern vascular plants are... Show more The most basic division of modern plants is between nonvascular and vascular plants. Modern nonvascular plants are called bryophytes. There are about 17,000 bryophyte species. They include liverworts, hornworts, and mosses, which are the most numerous group of bryophytes. Most bryophytes are small. They lack not only vascular tissues but also true roots, leaves, seeds, and flowers. Bryophytes live in moist habitats. Without the adaptations of vascular plants, bryophytes are not very good at absorbing water. They also need water to reproduce. Modern vascular plants are called tracheophytes. Their vascular tissues are specialized to transport fluid. This allows them to grow tall and take advantage of sunlight high up in the air. It also allows them to live in drier habitats. Most plants today are tracheophytes. There are hundreds of thousands of species of them. Although some tracheophytes, including ferns, do not produce seeds, most tracheophytes are seed plants. Modern seed plants include gymnosperms and angiosperms. Gymnosperms are seed plants that produce naked seeds in cones. There are about 1000 species of gymnosperms. Conifers such as spruce trees are the most common group of gymnosperms. Angiosperms are seed plants that produce seeds in the ovaries of flowers. Today, they are by far the most diverse type of seed plants. In fact, the vast majority of all modern plants are angiosperms. There are hundreds of thousands of species of them. An apple tree is an example of a common angiosperm. Show less
The most basic division of modern plants is between nonvascular and vascular plants. Modern nonvascular plants are called bryophytes. There are about 17,000 bryophyte species. They include liverworts, hornworts, and mosses, which are the most numerous group of bryophytes. Most bryophytes are small. They lack not only vascular tissues but also true roots, leaves, seeds, and flowers. Bryophytes live in moist habitats. Without the adaptations of vascular plants, bryophytes are not very good at absorbing water. They also need water to reproduce. Modern vascular plants are called tracheophytes. Their vascular tissues are specialized to transport fluid. This allows them to grow tall and take advantage of sunlight high up in the air. It also allows them to live in drier habitats. Most plants today are tracheophytes. There are hundreds of thousands of species of them. Although some tracheophytes, including ferns, do not produce seeds, most tracheophytes are seed plants. Modern seed plants include gymnosperms and angiosperms.
Gymnosperms are seed plants that produce naked seeds in cones. There are about 1000 species of gymnosperms. Conifers such as spruce trees are the most common group of gymnosperms.
Angiosperms are seed plants that produce seeds in the ovaries of flowers. Today, they are by far the most diverse type of seed plants. In fact, the vast majority of all modern plants are angiosperms. There are hundreds of thousands of species of them. An apple tree is an example of a common angiosperm.
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