Exam-style questions by topic — Edexcel A-Level Biology B
One verified question for each of 10 topics. These are written for this specification and checked by MasteryMind. They are not past-paper questions, and they are not from Pearson Edexcel.
Topic 1: Biological Molecules
A lake cools from 6 °C to 2 °C during winter. Use the property of maximum density at 4 °C to explain what happens to the water and how this affects organisms in the lake.
Practise Topic 1: Biological MoleculesTopic 10: Ecosystems
In an ecosystem, which term describes the total energy captured by producers in photosynthesis before any energy is lost through respiration?
Practise Topic 10: EcosystemsTopic 2: Cells, Viruses and Reproduction of Living Things
In an investigation into pollen tube growth, a student measures the length of a single pollen tube at five different sucrose concentrations. Which improvement would most increase the reliability of the results?
Practise Topic 2: Cells, Viruses and Reproduction of Living ThingsTopic 3: Classification and Biodiversity
A habitat contains 15 individuals of species A, 10 of species B and 5 of species C. Using the formula D = N(N - 1) / Σn(n - 1), what is the index of diversity (D) for this habitat?
Practise Topic 3: Classification and BiodiversityTopic 4: Exchange and Transport
How does the tracheal system of an insect adapt to supply oxygen more efficiently to muscle tissues during periods of vigorous activity?
Practise Topic 4: Exchange and TransportTopic 5: Energy for Biological Processes
In which part of a mitochondrion are the protein complexes of the electron transport chain embedded?
Practise Topic 5: Energy for Biological ProcessesTopic 6: Microbiology and Pathogens
A virus infects a body cell, and viral antigens are displayed on that cell's surface. Which sequence correctly describes the cell-mediated response that leads to destruction of the infected cell?
Practise Topic 6: Microbiology and PathogensTopic 7: Modern Genetics
Which statement describes the defining characteristics of a stem cell?
Practise Topic 7: Modern GeneticsTopic 8: Origins of Genetic Variation
In a population at Hardy-Weinberg equilibrium, the frequency of the recessive allele a is 0.4. What is the frequency of heterozygous individuals?
Practise Topic 8: Origins of Genetic VariationTopic 9: Control Systems
Why is it important that body temperature is maintained close to 37 °C in humans?
Practise Topic 9: Control Systems
Practise all 201 verified questions and see your weak topics.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge