IA MODIFIED MASTERING BIOLOGY WITH E TEX
IA MODIFIED MASTERING BIOLOGY WITH E TEX
12th Edition
ISBN: 9780136781752
Author: Urry
Publisher: PEARSON
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Chapter 30, Problem 10TYU
Summary Introduction

To describe: How contribution of seeds and other adaptations led to rise of seed plants and made them dominant in plant communities.

Introduction:

Seed plants, also known as spermatophytes, consist of those plants that produce seeds. The presence of seeds and other adaptations has played a pivotal role in helping them to survive in various conditions and making them a dominant form of plant. The major features of the seed plants include seeds and pollen grains. The seeds aid in protecting the embryo in extreme environments, while the pollen grains provide mobility to the sperm. It enables the movement of sperm from one plant to a new plant, thus helping in pollination and formation of a seed. The means of dispersion of pollens can be either by the help of wind or by an animal. Hence, it can travel to longer distances and to various places to help in pollination. Thus, seeds and other adaptations have contributed to the rise of seed plants, and their dominance in plant communities.

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1.) Community Diversity: The brown and orange line represent two different plant communities. a. Which color represents the community with a higher species richness? b. Which color represents the community with a higher species evenness? Relative abundance 0.1 0.04 0.001 2 4 6 8 10 12 14 16 18 20 22 24 Rank abundance c. What is the maximum value of the Simpson's diversity index (remember, Simpson's index is D = p², Simpson's diversity index is 1-D)? d. If the Simpson's diversity index equals 1, what does that mean about the number of species and their relative abundance within community being assessed?
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