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Unformatted text preview: 13-1 SPRING 2010 NAME BTNY 210 LABSECTIONLABORATORY #13(ANGIOSPERMS)Lab #13 Objectives:1) Study the differences in monocot and dicot flower structure 2) Be able to identify the 4 whorls of a complete flower 3) Become familiar with the floral characteristics involved in attracting pollinators 4) Learn the basic structure of a dicot seed 5) Recognize the difference between a dehiscent and an indehiscent fruit A. OVERVIEW OF THE ANGIOSPERMS (Phylum Anthophyta) Angiosperms are the most diverse and important of the plant groups in terms of global impact. We depend heavily on them for food and fiber. There are about 235,000 species of flowering plants all of which fall into one of two classes, monocots (65,000 species) or dicots (170,000 species). Although the dicots outnumber the monocots, the latter are very important to us because of the staple food crops they produce (rice, wheat, and corn, among others). Review characteristics of monocots and dicots and fill in this table: MonocotsDicotsNumber of flower parts Leaf venation pattern Fibrous or tap root system Number of cotyledons The formation of flowers in angiosperms was a large step up the evolutionary ladder. In angiosperms, as in the gymnosperms, the gametophyte remains attached to the sporophyte. Following pollination and fertilization, the new sporophyte embryo and the surrounding seed structures develop inside a fruit, which forms from the ovary of the flower. Angiosperms have developed many different mechanisms for dispersing fruits and their enclosed seed containing the embryo of the next sporophyte generation. 13-2 B. FLOWER STRUCTURE Working in your groups, observe the structure of lily and snapdragon flowers. Your TA will start by going through the lily flower structure with you. 1. What is the function of each of the parts of a flower? a) Sepals: b) Petals: c) Stamens: d) Pistil: 2. Which generation produces the flower, gametophyte or sporophyte? 3. Dissect both the lily and snapdragon flower and complete the table below. Dissecting microscopes are available to help you identify smaller structures. The terms regular/irregular petals and inferior/superior ovary are defined at the bottom of pg. 13-8....
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