Multiple Choice
When using a dichotomous key to identify organisms, which of the following best describes the process?
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1. Introduction to Biology
Introduction to Taxonomy
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In the context of fern gametophytes, what is the typical shape of the prothallus?
A
Heart-shaped
B
Spiral-shaped
C
Star-shaped
D
Rod-shaped
Verified step by step guidance1
Understand the context: Fern gametophytes are the haploid stage in the fern life cycle, responsible for producing gametes (sperm and eggs). The prothallus is the structure that represents the gametophyte.
Recall the typical morphology of a fern prothallus: It is a small, flat, and photosynthetic structure that supports the reproductive organs (archegonia and antheridia).
Identify the characteristic shape: The prothallus is typically heart-shaped, which allows it to maximize surface area for photosynthesis and nutrient absorption.
Eliminate incorrect options: Spiral-shaped, star-shaped, and rod-shaped do not describe the morphology of a fern prothallus.
Conclude that the correct answer is 'Heart-shaped,' as it matches the typical description of a fern gametophyte's prothallus.
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