IB Biology HL 4.1.3 Overpopulation and Competition
Practise identifying the combined roles of overpopulation, competition and variation as conditions for natural selection.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Identify overpopulation, competition and variation as interacting conditions for natural selection.
D4.1.3—Overproduction and competition question 1
[Maximum number: 1]
The Atlantic cod (Gadus callarias) is a fish which lays about 5000000 eggs in its lifetime. On average, only two of these eggs survive to become adult cod. How does this promote evolution?
A
All offspring are genetically identical, so become better adapted.
B
Laying many eggs provides food for other species to survive and become better adapted.
C
Some young cod change to become adapted to the environment and survive and pass on their genes.
D
Offspring with favourable variations survive and pass on their genes.
D
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