Book cover for Biology : The Unity and Diversity of Life

Biology : The Unity and Diversity of Life

Cecie Starr, Christine A. Evers; Lisa Starr

ISBN #9781337408332

15th Edition

734 Questions

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4,261 Students Helped

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Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

This section covers the diverse mechanisms of reproduction in flowering plants, emphasizing the intricate structure of flowers, the complex processes of pollination and double fertilization, and the subsequent development of seeds and fruits. It also contrasts sexual reproduction with asexual methods such as grafting and vegetative propagation, underscoring their roles in maintaining biodiversity and supporting agriculture. The decline of pollinator populations, notably honeybees due to factors like CCD and pesticide exposure, has far-reaching implications for food production and ecosystem health.

Learning Objectives

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Key Concepts

CONCEPT

DEFINITION

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Example Problems

Example 1

The arrival of pollen grains on a receptive stigma is called _______. a. germination c. pollination b. fertilization d. propagation

Example 2

An animal pollinator may be rewarded by________ when it visits a flower of a coevolved plant (choose all that apply). a. pollen c. hormones b. nectar d. fruit

Example 3

The _______ of a flower contains one or more ovaries in which eggs develop, fertilization occurs, and seeds mature. a. pollen sac b. carpel c. receptacle d. sepal

Example 4

In flowers, the structures that produce male gametophytes are called _____ ; the structures that produce female gametophytes are called _________. a. carpels; stamens b. anthers; carpels c. pollen grains; flowers d. megaspores; microspores

Example 5

Meiosis of cells in pollen sacs forms haploid __________ a. megaspores c. stamens b. microspores d. sporophytes

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Step-by-Step Explanations

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Common Mistakes

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