What is a 15 meter tall tree fern?
A. a gametophyte
B. haploid
C. produced by meiosis
D. a sporophyte
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about ferns? What other information is related to the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
D. a sporophyte
Clarify Question
What is the key concept addressed by the question?
· The question is asking about the nature of a fern that reaches a large size.
What type of thinking is required?
· You are being asked to take what you already know and use, or apply, it to determine the identity of a very large fern.
Gather Content
What do you already know about ferns? What other information is related to the question?
· The sporophyte is the dominant life stage of the fern.
· Sporophytes are diploid.
· Fern sporophytes have vascular tissues, but fern gametophytes do not have vascular tissues.
· Gametophytes are haploid.
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
· Since fern gametophytes lack vascular tissues, they remain very small, so this answer can be excluded.
· Gametophytes but not sporophytes, are haploid, so this answer can also be excluded.
· Gametes are produced by meiosis, so this answer can be disregarded.
· Sporophytes possess vascular tissue and can thereby grow to very large sizes. 15 meters is within an expected size for the sporophyte of a tree fern.
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
· Answering this question correctly depended on your ability to use fern life stages in a new situation. If you got an incorrect answer, did you remember that ferns can exist as sporophytes and gametophytes, or that sporophytes alone can grow to large sizes? Did you have trouble extending fern life stages to determine the correct answer?
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