SQA National 5 Biology Practice Exam

The characteristic that increases an organism's survival in changing environments is adaptation. Adaptation refers to the process by which organisms develop traits that enhance their ability to live and reproduce in specific environments. These traits can be structural, behavioral, or physiological changes that arise over generations through natural selection. For example, animals in cold climates may develop thicker fur for insulation, while plants in arid regions might evolve deeper root systems to access water.

In dynamic environments, the ability to adapt is crucial because it allows organisms to respond effectively to changes such as shifts in climate, availability of food, or the presence of new predators. This versatility in responding to environmental pressures ultimately enhances an organism’s fitness, increasing the likelihood of survival and reproduction.

Other options do not contribute positively to survival in changing environments. Static traits do not evolve or provide the flexibility needed to cope with new challenges. Inactivity could lead to missed opportunities for obtaining resources, while population size alone does not guarantee survival or adaptability; larger populations may still struggle if they lack advantageous adaptations.