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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Apply Evolutionary Thinking The first angiosperms may originally have been small, treelike plants in tropical regions, but eventually they began diversifying rapidly into other habitats where early gymnosperms flourished. South African botanist William Bond proposed the “slow seedling” hypothesis to help explain this evolutionary change, and botanists continue to refine it. The hypothesis proposes that angiosperms were able to encroach on many habitats where ancient gymnosperms lived, in part because flowering species increasingly evolved adaptations that made them fast-growing herbaceous plants. Gymnosperms grow more slowly. Based on your reading of this chapter and Chapter 29, what are some structural and biochemical features of gymnosperms (such as conifers) that might result in slower growth, putting them at a competitive disadvantage in this scenario?

Summary Introduction

To review:

The structural and biochemical features of gymnosperms (such as conifers) that might result in slower growth, therefore, putting them at a competitive disadvantage with respect to angiosperms as, they are able to encroach on many habitats.

Introduction:

Vascular seed plants include two major groups that are angiosperms and gymnosperms. Gymnosperms are naked seed plants whereas, angiosperms are flowering seed plants. Conifers are the most widespread gymnosperms.

Explanation

Gymnosperms contain a male and female gametophyte for sexual reproduction wherein, the female cone is bigger than the male cone. The pollen (male gametophyte) is pollinated through the wind to the female gametophyte. Double fertilization does not occur as ovaries are absent in gymnosperms. The gametes are present on the cone instead of the flowers. They rely on wind pollination for fertilization and find it difficult to self-pollinate...

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