How is biodiversity defined?

• A. The total number of plants in an area
• B. The variety of life in a habitat or ecosystem
• C. The quantity of available water resources
• D. The amount of air pollution in a region

Answer: (B)

Biodiversity is defined as the variety of life in a habitat or ecosystem. This concept encompasses the different species of plants, animals, fungi, and microorganisms, as well as the genetic diversity within these species and the ecosystems they form. It plays a crucial role in maintaining ecosystem health, resilience, and functionality. A single ecosystem can host a vast array of species, each contributing to the overall balance and sustainability of the environment.

Other choices focus on specific components rather than the comprehensive concept that biodiversity represents. For instance, counting the total number of plants in an area captures only a portion of biodiversity and does not consider animals or microorganisms. Quantifying available water resources and measuring air pollution are environmental factors, but they do not reflect the richness of life forms and their ecological interactions, which is the essence of biodiversity. Thus, the definition that captures the range and dynamics of life in ecosystems is accurately represented by the correct answer.