Packet 10: Bonus 5

Answer the following about Prototaxites (“proto-tax-EYE-teez”), the earliest known tree-like organism on land. For 10 points each:
[10e] Prototaxites is usually assigned to this kingdom because the thread-like structures of its trunk resemble hyphae (“HI-fee”). Modern members of this kingdom include yeasts and mushrooms.
ANSWER: Fungi [or fungus]
[10m] A 2025 study called the organism’s classification into question by not detecting this compound in Prototaxites. Fungal cell walls contain this polymer of N-acetyl•glucosamine, as do arthropod exoskeletons.
ANSWER: chitin (“KYE-tin”)
[10h] Prototaxites towered over early land plants during this geologic period. During this period, which saw the emergence of the tetrapods, placoderm fish such as Dunkleosteus dominated the seas.
ANSWER: Devonian period (The period is also called the “age of fishes.”)
<Biology — June Yin> | SHOW-ME Four Packet 10

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