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LAB 7 Plant Biology S22.docx - Biology 001 Laboratory...

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Biology 001Laboratory Exercise 7Plant Biology(Plant Anatomy)Total time commitment: 3 hoursNAME Last: MarinersteinFirst:ChloeDate Submitted:11/07/22Section # 07Page 1 of 16
ACTIVITY IA – Plant Flower Anatomy(time estimate 50 minutes).ACTIVITY IB – Anthers(time estimate 20 minutes).Objectives: Students should be able to:IntroductionThe kingdom Plantae contains 21% of the known living species on Earth. Plants constitutethe vast majority of biomass on the planet. It is this biomass which supports most life.Available to students are a selection of flowering plants that are in bloom – the buds areopen and the flowers exposed.Procedurea.Carefully remove 1 flower from each of 2 different plants for your group. Handlewith care to minimize damage.b.Examine the entire flower. Note the position and numbers of sepals, petals, stamens,and form of pistil. Identify and count each of these structures for each of the twoflowers in your possession.The male spores are generated inside the anthers. Each anther has four pollen sacs withinwhich the haploid spores are made. These spores divide once by mitosis to produce a two-cell structure. These two cells are covered with a protective coat and are called pollengrains.The anther walls split, and the pollen grains are released and dispersed (either by wind,insect, or animal assistance). When the pollen grains land upon the stigma of an adjacentplant, the pollen grain germinates and produces a long, slender, hollow structure called thepollen tube. The pollen tube is a cellular extension that penetrates the style. One of thecells of the pollen grain divides and gives rise to two sperm. Both these sperm travel alongthe pollen tube into the ovary, where fertilization may ensue.SECTION I – Plant Anatomy1.Comprehend the biology of higher plants2.Become familiar with the anatomy of a flowering plant3.Understand the various types of fruits4.Recognize the different stages of a plant life cycle
ACTIVITY IC – Flower Pistil(time estimate 20 minutes).MaterialsLight MicroscopeVarious sets of prepared Plant Anthers slidesProcedurea.Examine the two slides of anthers provided: one of a lily anther cross section and theother of a lily bud cross section.b.Observe and identify the entire anther, pollen sacs, and pollen grains.Inside each ovary of a plant is one or more ovules. The ovules are the site of meiosis andproduction of egg cells. The egg cell is found in a hollow cavity in the ovule. When the pollentube reaches this cavity, the sperm cells are released. One will fertilize the egg (forming azygote) and the other will help form the endosperm. The zygote divides by mitosis andbecomes an embryo. The embryo will grow by mitotic divisions and will eventually grow intoa seed.

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Term
Spring
Professor
Dulai,Kamal
Tags
Root Systems

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