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1 Biology 1 of 28
2 2 of 28
3 22-4 Seed Plants Seed plants are the most dominant group of photosynthetic organisms on land. 3 of 28
4 22-4 Seed Plants Seed plants are divided into two groups: Gymnosperms bear seeds directly on the surfaces of cones. Angiosperms, or flowering plants, bear seeds within a layer of tissue that protects the seed. 4 of 28
5 22-4 Seed Plants Gymnosperms include conifers, cycads, ginkgoes, and gnetophytes. Angiosperms include grasses, flowering trees and shrubs, and all species of flowers. 5 of 28
6 Reproduction Free From Water Reproduction Free From Water Seed plants have a life cycle that alternates between a gametophyte stage and a sporophyte stage. They do not need water for fertilization of gametes. Seed plants can live just about anywhere. 6 of 28
7 Reproduction Free From Water What adaptations allow seed plants to reproduce without standing water? 7 of 28
8 Reproduction Free From Water Adaptations that allow seed plants to reproduce without water include: flowers or cones the transfer of sperm by pollination the protection of embryos in seeds 8 of 28
9 Reproduction Free From Water Cones and Flowers Gametophytes grow within sporophytes called cones, which are the seed-bearing structures of gymnosperms, and flowers, which are the seedbearing structures of angiosperms. Gametophyte generations live inside these structures. 9 of 28
10 Reproduction Free From Water Pollen The male gametophyte is contained in a tiny structure called a pollen grain. Sperm do not need water to fertilize eggs; instead the pollen grain is carried to the female reproductive structure by wind, insects, or small animals. This transfer of pollen is called pollination. 10 of 28
11 Reproduction Free From Water Seeds A seed is an embryo of a plant that is encased in a protective covering and surrounded by a food supply. An embryo is an organism in its early stage of development. The seed coat surrounds and protects the embryo and keeps contents of the seed from drying out. 11 of 28
12 Reproduction Free From Water Internal Structures of a Seed 12 of 28
13 Reproduction Free From Water Seeds may have special tissues or structures that aid in their dispersal to other habitats. Some seed coats stick to the fur or feathers of animals. Other seeds are within tissues eaten and dispersed by animals. 13 of 28
14 Reproduction Free From Water After fertilization, the zygote grows into a plant the embryo. The embryo can stop growing while it is within the seed, and it can remain this way for a long time. When it grows, it uses nutrients from the stored food supply. Seeds can survive extreme cold or heat, or even drought. 14 of 28
15 Evolution of Seed Plants Evolution of Seed Plants The fossil record indicates that ancestors of seed plants evolved adaptations enabling them to survive where most mosses and ferns could not. The most important of these adaptations was the seed itself. A seed can survive dry conditions and extreme temperatures. 15 of 28
16 Gymnosperms Cone Bearers What are the four groups of gymnosperms? 16 of 28
17 Gymnosperms Cone Bearers Gymnosperms Cone Bearers The four groups of gymnosperms are: gnetophytes cycads ginkgoes conifers 17 of 28
18 Gymnosperms Cone Bearers Gnetophytes About 70 present-day species of the phylum Gnetophyta are known, placed in just three genera. Reproductive scales of these plants are clustered into cones. 18 of 28
19 Gymnosperms Cone Bearers Cycads Cycads are palmlike plants that reproduce with large cones. They first appeared during the Triassic, 225 million years ago. Today, only nine genera of cycads exist. They grow naturally in tropical and subtropical places. 19 of 28
20 Gymnosperms Cone Bearers Ginkgoes Today the phylum Ginkgophyta contains only one species, Ginkgo biloba. The living Ginkgo species looks like its fossil ancestors. Ginkgo trees are planted in U.S. cities because of their resistance to air pollution. 20 of 28
21 Gymnosperms Cone Bearers Conifers Conifers are the most common gymnosperms, with more than 500 known species. Conifers include pines, spruces, firs, cedars, sequoias, redwoods, junipers, and yews. 21 of 28
22 Gymnosperms Cone Bearers Ecology of Conifers Conifer leaves have specific adaptations to dry conditions. Most developed long, thin leaves, which reduce evaporation. Their leaves have a thick, waxy layer. Most conifers are evergreens and retain leaves all year. 22 of 28
23 22 4 Continue to: - or - Click to Launch: 23 of 28
24 22 4 All of the following are adaptations that allow seed plants to reproduce without water EXCEPT a. transfer of sperm by pollination. b. production of spores. c. protection of embryos in seeds. d. supplying embryos with food. 24 of 28
25 22 4 The early developmental stage of the sporophyte in seed plants is known as the a. seed coat. b. seed. c. embryo. d. endosperm. 25 of 28
26 22 4 Which of the following is a water-conserving adaptation in conifers? a. presence of cones b. long, thin needles c. no vascular tissue in the leaves d. seed coats 26 of 28
27 22 4 Each species of seed plant reproduces by means of a. cones only. b. flowers only. c. both cones and flowers. d. either cones or flowers. 27 of 28
28 22 4 The group of gymnosperms having the greatest number of species are the a. gnetophytes. b. conifers. c. cycads. d. ginkgoes. 28 of 28
29 END OF SECTION
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