IB Biology HL A4.2 Conservation of biodiversity questions

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Question 1

Multiple choiceMedium1 mark

A conservation team compares four candidate species. The tree shows their relationships and relative branch lengths; the status labels show whether each species is globally endangered. Which candidate best fits the EDGE programme’s conservation-prioritization rationale?

Species KNot globally endangeredSpecies LGlobally endangeredSpecies MGlobally endangeredSpecies NNot globally endangered012345678910Relative evolutionary history (units)
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Answer: B. EDGE prioritization considers both evolutionary distinctness and global endangerment. The tree shows that Species L has a longer branch not shared with close relatives than Species M: 5 units compared with 1 unit. Both are globally endangered, whereas Species K’s longer independent branch is labelled not globally endangered. Species L therefore fits both considerations.

A: selects the longest independent lineage but overlooks that Species K is not globally endangered.
C: uses the global-endangerment label but overlooks that Species M shares most of its recent lineage with Species N.
D: could result from misreading Species N’s status; it is not globally endangered and has only a short unshared branch.

Remember: EDGE combines evolutionary distinctness with global endangerment.

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