Fig. 29-1

Fig. 29-1

Table 29-1

Origin of land plants (about 475 mya) 1 Origin of vascular plants (about 420 mya) 2 Origin of extant seed plants (about 305 mya) 3 Liverworts Nonvascular plants (bryophytes) Land plants Fig. 29-7 Hornworts ANCES- TRAL GREEN ALGA 1 Mosses Lycophytes (club mosses, spike mosses, quillworts) Seedless vascular plants Vascular plants 2 Pterophytes (ferns, horsetails, whisk ferns) Gymnosperms 3 Seed plants Angiosperms 50 500 450 400 0 350 300 Millions of years ago (mya)

Polytrichum commune, hairy-cap moss Sporophyte (a sturdy plant that takes months to grow) Capsule Fig. 29-9d Seta Gametophyte

An Anthoceros hornwort species Fig. 29-9c Sporophyte Gametophyte

Gametophore of female gametophyte Thallus Sporophyte Fig. 29-9a Foot Seta Capsule (sporangium) Marchantia polymorpha, a “thalloid” liverwort 500 µm Marchantia sporophyte (LM)

Plagiochila deltoidea, a “leafy” liverwort Fig. 29-9b

Spores Sporangium Fig. 29-5c Longitudinal section of Sphagnum sporangium (LM) Sporophyte Gametophyte Sporophytes and sporangia of Sphagnum (a moss)

Fig. 29-11a (a) Peat being harvested

Fig. 29-11b (b) “Tollund Man,” a bog mummy

Raindrop Sperm “Bud” Antheridia Male gametophyte (n) Key Haploid (n) Protonemata (n) Diploid (2n) Fig. 29-8-3 “Bud” Egg Gametophore Spores Archegonia Female gametophyte (n) Spore dispersal Rhizoid Peristome FERTILIZATION Sporangium (within archegonium) MEIOSIS Seta Zygote (2n) Capsule (sporangium) Mature sporophytes Foot Embryo Archegonium Young sporophyte (2n) 2 mm Female gametophytes Capsule with peristome (SEM)

Gamete from another plant Gametophyte (n) Mitosis Mitosis n n n n Spore Gamete Fig. 29-5a MEIOSIS FERTILIZATION Zygote 2n Mitosis Sporophyte (2n) Alternation of generations

Selaginella apoda, a spike moss Fig. 29-15b 1cm

Isoetes gunnii, a quillwort Fig. 29-15c

2.5 cm Strobili (clusters of sporophylls) Fig. 29-15d Diphasiastrum tristachyum, a club moss

Athyrium filix-femina, lady fern Fig. 29-15f 25 cm

Equisetum arvense, field horsetail Fig. 29-15g Vegetative stem Strobilus on fertile stem 1.5 cm

Psilotum nudum, a whisk fern Fig. 29-15h 2.5 cm

Key Haploid (n) Diploid (2n) Antheridium Spore (n) Young gametophyte Spore dispersal MEIOSIS Fig. 29-13-3 Sporangium Mature gametophyte (n) Sperm Archegonium Egg Mature sporophyte (2n) New sporophyte Sporangium Zygote (2n) FERTILIZATION Sorus Gametophyte Fiddlehead

Fig. 29-1

Fig. 29-1

Presentation Transcript

Fig. (1):

Fig. 1

FIG.1

Fig. 1

Fig. 1.

Fig. 1

Fig 1

Fig. 1

Fig. 1

Fig. 1

Fig. 1-29

Fig. (1):

Fig. 1

Fig. 1

Fig. 1

Fig.1

Fig. 1

Fig. 1

Fig. 1