4 Objectives:To identify the characteristics of gymnosperms and describe how they reproduce.To describe the characteristics of angiosperms and their flowers.To explain how angiosperms reproduce.To describe the two types of angiosperms.To list products from seed plants.
5 GymnospermsGymnosperms are plants that produce naked seeds. Their seed are not enclosed by a protective fruit. Reproductive structures are cones.
6 GymnospermsGymnosperms are plants that do not have an ovary. Reproductive structures are cones.Gymnosperms consists of four phyla which are cycads, ginkgoes, conifers and gnetophytes.
7 GymnospermsCycads are topical plants that look like palm trees.
8 Cycas revoluta from Hawaii, showing female cones bearing large, orange seeds. Image from
9 Cycas revoluta from Hawaii, showing the male cone bearing numerous pollen-producing sporangia. Image from
10 GymnospermsConifers are the largest group of gymnosperms. Most of them are evergreens.
22 Reproduction in Gymnosperms Pollination is the process in which pollen is carried from male to female reproductive parts.In fertilization, the sperm cell joins with the egg cell.Seeds develop and the female cone increases in size.
23 When the seeds are mature, the scales open and the wind scatters the seeds.
26 AngiospermsAngiosperms are plants that develop seeds within a structure called the ovary. Reproductive structures are flowers.Angiosperms make up the largest group of plants in the world--the flowering plants.
27 FlowersFlowers are the structures that contain the reproductive organs of angiosperms.
30 Flower StructureSepals are the leaf-like structures that enclose the bud.Petals are the colorful, leaf-like and fragrant structures that attract insects and other animals.
31 Flower StructureStamen is the male reproductive organ that consist of the filament which is a thin stalk topped by a knoblike part called the anther.
32 Flower StructurePistil is the female reproductive organ and is located in the center of the flower. The pistil consists of a sticky tip called the stigma at the end of a slender tube called the style.
33 Flower StructureOvary is a hollow structure at the base of the flower that contains the ovule or ovules.A flower is pollinated when a grain of pollen lands on the pistil. The sperm cell will join the egg cell.After the egg cell is fertilized, the ovule develops into a seed and the ovary becomes a fruit that encloses and protects the seeds.
35 ActivityHave students feel the shape, weight, and texture of several fruits. Ask students to describe how the physical characteristics of each fruit and its seeds might be related to the way in which its seeds are dispersed.
36 AngiospermsAngiosperms are divided into two major groups: monocots and dicots.“Cot” is short for cotyledon or seed leaf.
37 Monocots are angiosperms that have only one seed leaf. Mono meaning one. Dicots produce seeds with two seed leaves. Di meaning two.
38 Monocots Examples: grasses, corn, wheat, rice lilies, tulips Leaves have parallel veinsStems have randomly scattered bundles of vascular tissue.Flowers have petals in multiples of three.
39 Dicots Examples: roses, violets, dandelions, oak, maple, beans, apples Leaves have branching veins.Vascular tissue is arranged in a ring.Flowers have petals in multiples of four or five.