Chapter 29 Reading Quiz. About how many species of plants inhabit earth today? What are the two generations in the “alternation of generations”? What structure made of waxes coats most land plant’s leaves? What is the purpose of the structure in #3?
2. Diagram a generalized plant life cycle indicating which generation is sporophyte/gametophyte, which individuals are haploid/diploid, where meiosis occurs and where mitosis occurs.
Division (instead of Phylum)
5. Using the classification scheme presented in the text, list the plant divisions; give the common name for each; and categorize them into nonvascular, vascular seedless and vascular seed plants.
Bryophyta the mosses
Hepatophyta the liverworts
Anthocerophyta the hornworts
13. Describe six adaptations of vascular plants, including modifications of the life cycle and modifications of the sporophyte that have contributed to their success on land.
Lycophyta the club mosses and ground pines
Sphenophyta the horsetails
Pterophyta about 12,000 species of ferns
- produces a single type of spore
- each spore develops into a plant with both sex organs
- produces 2 types of spores
1. Megaspores – female with archegonia
2. Microspores – male with antheridia
Spore – haploid cell that produces the gametophyte
Sporophyte – multicellular diploid form resulting from the union of gametes; produces spores
Sporophyll – where sporangia are found – leaves that are specialized for reproduction
Sporangium – capsule in which meiosis occurs and haploid spores develop
- organic rubble of the seedless plants accumulated as peat
- later it was covered by the sea and sediments, heat and pressure transformed the peat into coal