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Biology: The Dynamic Science (Mind...

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

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892
Chapter 28.3, Problem 1SB
Textbook Problem
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Compare and contrast the lycophyte and bryophyte life cycles with respect to the sizes and longevity of gametophyte and sporophyte phases.

Summary Introduction

To review:

Compare and contrast the lycophyte and bryophyte life cycles with respect to the sizes and longevity of the gametophyte and sporophyte phases.

Introduction:

The evolutionary classification of plants has shown that all terrestrial plants have evolved from aquatic green algae, called charophyceans. The presence of chlorophyll and cellulose are some evidences of evolution. Bryophytes are nonvascular plants, whereas phylum lycophyta comes under seedless vascular plants. The life cycles of both plants follow the alternation of a generation with the gametophyte phase and the sporophyte phase. Sporophytes are the spores produced by the diploid plant and gametophytes are the gametes released from the haploid plant.

Explanation of Solution

The life cycle of bryophytes is very different from the life cycle of lycophytes, which come under vascular seedless plants. The differences are described in the following table:

Lycophytes life cycle Bryophytes life cycle
Gametophyte phases are shorter than the sporophyte phase in lycophytes. Gametophyte phases are longer than the sporophyte phase in bryophytes.
It depends on mycorrhizae for its nutrition...

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