Lab # 3 - Kingdom Plantae

Lab # 3 - Kingdom Plantae - The Evolution and Diversity of...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: The Evolution and Diversity of Plants Lab # 3 Kingdom Plantae Characteristics of Plants o Form Multicellular o Nutrition Photosynthetic o Habitats Primarily adapted for life on land A number have acquired characteristics for life in aquatic habitats o Size Very large Diverse More than 280,000 species Characteristics of Plants in Common w/ Green Alga (Phylum Chlorophyta) o Pigments Chlorophyll a primary pigment Cholorphyll b, the carotenoids xanthophylls accessory pigment o Major Storage Product Excess carbohydrates in the form of starch Starch is stored within the chloroplasts o Cell Wall Cellulose o Reproduction Sporic meiosis A well-defined alternation of generations All plants pass through both a multicellular haploid stage and a multicellular diploid stage to reproduce sexually A multicellular diploid phase o (Termed the sporophyte generation) o Gives rise to haploid spores through the process of meiosis These spores o Grow into a multicellular haploid phase (termed the gametophyte generation) Gametophyes o Produce gametes o (Through process of mitosis and differentiation) Fertilization o When male gamete ( sperm ) combines w/ the females gamete (egg or ovum ) o Diploid zygote is formed Diploid zygote o Grows (via mitosis) into a multicellular sporophyte organism, and the process starts all over again o Plants are believed to have evolved from green alga Prior to Evolution of Plants o 550 million years ago o Life primarily aquatic Virtually no life on land o Terrestrial Environment Advantages No competition over habitat since there were no other life forms Resources From Plants Were More Abundant: o Light is not attenuated (reduced) in air as quickly as in water o CO diffuses more rapidly through air than water o Mineral elements were abundant in the primordial mineral soil Disadvantages Acquisition and maintenance of sufficient quantities of water o Loss of water was minimized by the evolution of a cuticle (a waxy coating covering the body) that prevented the evaporation of water from the cells o Cuticle also impedes movement of gases o Since plants need CO to absorb and O to release for photosynthesis, stomata (and, in some cases, pores ) evolved at about the same time to allow gas exchange To Understand Evolution of Plants o Examine extant (living) of plants o Purposes of lab: 1. To illustrate the diversity of extant plant live 2. To illustrate some of the more important characteristics and developments that arose in the plant kingdom over evolutionary time o Important to remember: Each group did not give rise to the subsequent group Each shared a common ancestor Yet, examining them in order will allow an understanding of the developments that took place over evolutionary time Groups of Plants o Bryophytes Size Small but diverse Relation Dont appear to be closely related Common Characteristics Btw Members:...
View Full Document

This note was uploaded on 10/06/2008 for the course BIOL 10514 taught by Professor Horner during the Spring '08 term at TCU.

Page1 / 14

Lab # 3 - Kingdom Plantae - The Evolution and Diversity of...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online