The male gametophytes of seed plants consist of a few cells enclosed by a sturdy wall made mostly of the resistant polymer ____.
A) sporopollenin
B) xylan
C) lignin
D) cellulose
E) pectin
Correct Answer:
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Q2: In heterosporous plants, megaspores form in _
Q3: The _ phylum has about 185 known
Q4: Archaeopteris belongs to the now-extinct lineage of
Q5: Seed plants as a whole belong to
Q6: Which evolutionary change was not one of
Q7: The buttery, edible flesh that encloses the
Q8: Living members of _ are often the
Q9: Seeds may remain dormant _, sprouting only
Q10: The only extant seed plants that have
Q11: The immature male gametophyte of seed plants
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