IB DP Biology Mock Exam SL Paper 1B Set 2 - 2025 Syllabus
IB DP Biology Mock Exam SL Paper 1B Set 2
Prepare for the IB DP Biology Exam with our comprehensive IB DP Biology Exam Mock Exam SL Paper 1B Set 2. Test your knowledge and understanding of key concepts with challenging questions covering all essential topics. Identify areas for improvement and boost your confidence for the real exam
Question
(a) The images show parts of plants belonging to two different phyla.
X: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Y: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
State the phylum of plant X and of plant Y.
b Explain one cause of mutation.
c. Outline the types of evidence that can be used to place a species in a particular clade.
d. The cladogram includes four marsupial (non-placental mammal) families.
Deduce the family that is most closely related to the Diprotodontoidea.
Answer/Explanation
Ans:
a)
X: Filicinophyta
Y: Coniferophyta/Conifera/Gymnosperms
b) 
c)
a. clade is a group of organisms that have evolved from a common ancestor
b. identify the base sequences of a gene
c. identify amino acid sequence of a protein
d. comparing homologous structures
e. the fewer the differences, the closer they diverged in time from a common ancestor Accept vice versa.
d)