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The phylogenetic tree below represents one model of the order and approximate time of appearance of the major groups of living organisms, and includes four groups represented by the letters R, S, T and U - VCE - SSCE Biology - Question 32 - 2017 - Paper 1
Question 32
The phylogenetic tree below represents one model of the order and approximate time of appearance of the major groups of living organisms, and includes four groups re... show full transcript
Worked Solution & Example Answer:The phylogenetic tree below represents one model of the order and approximate time of appearance of the major groups of living organisms, and includes four groups represented by the letters R, S, T and U - VCE - SSCE Biology - Question 32 - 2017 - Paper 1
Step 1
Correct placement of organisms on the phylogenetic tree
Answer
To determine the correct placement of the organisms based on the phylogenetic tree, we analyze the relationships and order of emergence shown.
- R represents bacteria, which are believed to have appeared first in the evolutionary timeline, thus fitting with option B.
- S represents protists, which evolved after bacteria.
- T indicates animals, which emerged following the protists.
- U corresponds to plants, appearing last in this model.
Thus, the correct ordering of organisms from the choices is:
- R – bacteria
- S – protists
- T – animals
- U – plants
This aligns with option B: R – bacteria, S – protists, T – animals.