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Chapter 26: Q. 15 (page 696)
Which of the following plant structures is not a defense against herbivory?
a. thorns
b. spines
c. nectar
d. alkaloids
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Seed plants are ________.
a. all homosporous
b. mostly homosporous with some heterosporous
c. mostly heterosporous with some homosporous
d. all heterosporous
Biosynthesis of nectar and nutrient-rich pollen is energetically very expensive for a plant. Yet, plants funnel large amounts of energy into animal pollination. What are the evolutionary advantages that offset the cost of attracting animal pollinators?
Which of the following traits characterizes gymnosperms?
a. The plants carry exposed seeds on modified leaves.
b. Reproductive structures are located in a flower.
c. After fertilization, the ovary thickens and forms a fruit.
d. The gametophyte is the longest phase of the life cycle.
The Cretaceous Period was marked by the increase in number and variety of angiosperms. Insects also diversified enormously during the same period. Can you propose the reason or reasons that could foster coevolution?
What are the two structures that allow angiosperms to be the dominant form of plant life in most terrestrial ecosystems?
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