Question
Which of the adaptations of flowers would be most successful for the survival of a species?
A. Spiny seeds for better wind dispersal
B. Different flowering times for better seed dispersal
C. Sticky pollen for better water dispersal
D. Specific odours for better insect pollination
▶️Answer/Explanation
Ans:D
What is the mechanism of natural selection?
A. Any individuals in a population can be selected entirely by chance.
B. After a change in the environment a species will evolve adaptations to the new conditions.
C. If an adaptation to the environment is useful, an individual will develop it and pass it on to its offspring.
D. Variations amongst individuals of a population are selected by a changing environment.
Answer/Explanation
Markscheme
D
A bacterial population with no resistance to an antibiotic may develop into a bacterial population with some resistance to an antibiotic. Which event could lead to this?
A. Antibiotic resistance was inherited from an ancestral population.
B. An antibiotic resistance plasmid is received from a bacterium in another population.
C. The enzyme needed for antibiotic resistance is received from a bacterium in another population.
D. The bacterial population mutated in response to antibiotics in the environment.
Answer/Explanation
Markscheme
B
Question
The graph shows variations in beak size for the bird Geospiza fortis on an island in the Galápagos archipelago.
What evidence from the graph indicates that disruptive selection is occurring?
A. An intermediate beak size is less common.
B. Median beak size is the most common.
C. Smaller beaks are favoured.
D. Larger beaks are favoured.
▶️Answer/Explanation
Ans:A