What are the two categories of seed plants?

Seed plants are called Spermatophytes. There are two groups of seed plants.

Gymnosperms

There are four divisions of Gymnosperms:

• Conifers


• Cycads


• Ginkgo


• Gnetophytes

Characteristics:

• Pollen grain is delivered to the ovule


• Seeds develop uncovered


• Lack vessels


• Pollen grains are carried by the wind


• Many have needle-like leaves, thick cuticles, and sunken stomata


• Used to produce paper, lumber, and resin

Angiosperms

There is one division of angiosperms called Anthophyta. Anthophyta is made up two classes, Dicotyledones (dicots) and Monocotyledones (monocots). Dicots and monocots can be distinguished based on their leaf vein patterns. In monocots, the veins are evenly spaced along the entire leaf. In dicots, the veins show extensive branching.

Characteristics:

• Pollen is transferred by wind, animal vectors, bees, other insects, bats, and birds


• Seeds develop inside the ovary


• Ovary develops into fruit


• Leaves can be undivided or contain many leaflets


• Produce flowering plants