A Level Biology Practice Exam

What is interspecific variation?

1. Variation within a single species

2. Differences between organisms of different species

3. Differences due to environmental factors

4. Variances in genetic mutations

The correct answer is: Differences between organisms of different species

Your choice is indeed correct. Interspecific variation refers to the differences that arise between organisms belonging to different species. This type of variation is influenced by numerous factors, including evolutionary processes, genetic differences, adaptations to different environments, and ecological interactions. Understanding interspecific variation is crucial for studying biodiversity, as it highlights how species adapt to their unique ecological niches and how these variations contribute to the overall functioning of ecosystems. For example, differences in size, shape, behavior, and physiology can all be tied back to species’ adaptations to their specific environments and lifestyles. The other options describe different concepts. Variation within a single species pertains to intraspecific variation, which focuses on differences among individuals of the same species. Differences due to environmental factors can influence both interspecific and intraspecific variation but are not exclusive to the distinctions between species. Finally, variances in genetic mutations can lead to variation within and among species but do not specifically define interspecific variation.