Multiple Choice
What is the term for a plant that produces seeds enclosed within a protective covering?
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28. Plants
Seed Plants
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The closest seedless relatives of seed plants produce one kind of spore that gives rise to a bisexual gametophyte. What does this suggest about the ancestors of seed plants?
A
They were gymnosperms.
B
They were bryophytes.
C
They were heterosporous.
D
They produced separate male and female gametophytes.
E
They were homosporous.
Verified step by step guidance1
Understand the terms: 'homosporous' means producing one type of spore that develops into a bisexual gametophyte, while 'heterosporous' means producing two types of spores, each developing into either a male or female gametophyte.
Identify the key characteristic of the closest seedless relatives of seed plants: they produce one kind of spore that gives rise to a bisexual gametophyte.
Relate this characteristic to the concept of homospory: since they produce one type of spore leading to a bisexual gametophyte, this suggests a homosporous nature.
Consider the evolutionary implications: if the closest seedless relatives of seed plants are homosporous, it suggests that the ancestors of seed plants were also homosporous.
Conclude that the correct answer is 'They were homosporous,' as this aligns with the characteristic of producing one kind of spore leading to a bisexual gametophyte.
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