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IBDP Biology 2025 HL Questions

1.6 Diversity of Organisms

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Question 1

Paper 1
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Question 2

Paper 1
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Question 3

What is a primary challenge in applying the biological species concept to asexually reproducing organisms?

A. Difficulty in observing morphological features

B. Inability to apply genetic analysis

C. Lack of interbreeding behaviours

D. Similarity in ecological niches

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Question 4

Which of the following best describes the purpose of the binomial system in classifying organisms?

A. Providing a universal method of identifying species based on genetic analysis

B. Assigning two-part scientific names to species for universal recognition and communication

C. Categorising species based on their ecological niches

D. Grouping species based on evolutionary history

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Question 5

Why might two individuals within the same species exhibit different phenotypic traits?

A. They share identical genomes

B. They have experienced different environmental influences

C. They belong to different genera

D. They reproduce asexually

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Question 6

What is a significant implication of chromosomal diversity among species?

A. It prevents genetic mutations

B. It indicates identical evolutionary histories

C. It contributes to the genetic variability and adaptability of species

D. It reduces the complexity of karyotypes

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Question 7

Which factor is NOT typically considered when defining a species using the morphological species concept?

A. Structural features

B. Colour patterns

C. Genetic sequences

D. Body size

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Question 8

During the process of speciation, what is the role of reproductive isolation?

A. It encourages gene flow between diverging populations

B. It prevents interbreeding and maintains species distinctions

C. It increases genetic homogeneity within populations

D. It accelerates the mutation rate within species

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Question 9

Why is genome size not necessarily indicative of an organism's complexity?

A. Larger genomes always correspond to more complex organisms

B. Genome size can be influenced by non-coding DNA and repetitive elements

C. Smaller genomes lack essential genetic information

D. All organisms have genomes of similar sizes

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Question 10

What is the significance of single-nucleotide polymorphisms (SNPs) in the study of genomic diversity?

A. They prevent mutations in DNA sequences

B. They are the most common type of genetic variation among individuals

C. They decrease genetic diversity within a population

D. They are only found in asexual organisms

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