THE SEED PLANT. A seed is a plant embryo and a food supply surrounded by a protective coat. 1.Gymnosperm. 2.Angiosperm. Flowering Plants. Non- Flowering Plants. The Gymnosperm. gymno = naked sperm = seed angeion = case,capsule.
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A seed is a plant embryo and a food supply surrounded by a protective coat
Non- Flowering Plants
Any plant that produce seeds but does not form flowers is classified as a Gymnosperm.
In gymnosperm, seeds develop without a protective wall. The seed of many gymnosperm are exposed to the air.They are on the surface of a cone scale. So gymnosperm are open seeded plant
Conifers : Coniferophyta
Cycads : Cycadophyta
Ginkgoes ; Ginkgophyta
Cones are structure that contain the seeds of the plant.
Conifers are woody plant that live in areas of the world that are neither too hot nor too cold.
Most conifers such as pine, cedars, and hemlocks, are called evergreen because they appear to keep their leaves all year. The leaves or needles may remain for 2 to 12 years.
Two exceptions are the larch and the bald cypress.lose their needles every fall.
Familiar trees such as pines, spruce, firs, and sequoias are conifers. They produce woody, seed-bearing structures called cones. The yew and juniper, produce seeds in cones that resemble berries.
Figure : Parts of a pine seed. Which part of the seed can grow into a pine tree?
Conifers grow larger and older than any other trees. One of the largest is a redwood in California, 100 meters tall and 10 meters wide.
Conifers produce male and female cones on the same tree. The male cones contain pollen and the female cones contain ovules. The pollen is carried to the female cones by wind.
After the pollen and the ovule join, a seed develops. As the seed matures, part of the cone dries up and release the seeds. When a seed falls to the ground, the seed may develop into a new conifer.
These tropical trees grow as tall as 18 meters. Cycads have large leaves.Like conifers, cycads have cones. But cycad trees are either male or female and the cones are located in the center of the leaves.
Figure : A Cycad.
Figure : Left : A ginkgo tree has broad, fan-shaped leaves.
Right :Zamia is a cycad
They have fan-shaped leaves and can grow as tall as 30 meters