What does biodiversity mean?

• A. The number of ecosystems in a region.
• B. The rate of photosynthesis in a forest.
• C. The variety of life in an area, including variability within species and between species.
• D. The growth rate of a population.

Answer: (C)

Biodiversity refers to the variety of life in an area, spanning genetic diversity within species, the number of different species, and the variety of ecosystems. This means it includes genetic variation in a population, how many species are present, and the range of habitats that support different communities. If you focus only on how many ecosystems exist, you’re looking at ecosystem diversity, which is part of biodiversity but not the whole idea. The rate of photosynthesis is about a plant’s energy conversion, not how many kinds of life exist. The growth rate of a population is about how a single population changes over time, not the overall diversity of life. So the best description is the variety of life in an area, including variability within species and between species.