Which of the following methods involves counting the number of organisms in a specific area?

• A. Radio telemetry
• B. Genetic analysis
• C. Quadrat sampling
• D. Mark-recapture

Answer: (C)

Verified step by step guidance

1. Understand the concept of quadrat sampling: Quadrat sampling is a method used in ecology to estimate the population size of organisms in a specific area. It involves placing a square frame (quadrat) of known dimensions on the ground and counting the number of organisms within that frame.
2. Identify the purpose of quadrat sampling: This method is particularly useful for studying plants, sessile animals, or slow-moving organisms in a defined area. It provides a snapshot of the population density and distribution within the quadrat.
3. Compare with other methods: Radio telemetry involves tracking animal movements using radio signals, genetic analysis involves studying DNA to understand genetic relationships, and mark-recapture involves capturing, marking, and releasing organisms to estimate population size. None of these methods involve directly counting organisms in a specific area like quadrat sampling does.
4. Consider the advantages of quadrat sampling: It is a straightforward and cost-effective method for estimating population size and density, especially in habitats where organisms are evenly distributed.
5. Apply quadrat sampling in practice: To perform quadrat sampling, randomly place several quadrats in the study area, count the organisms within each quadrat, and calculate the average number of organisms per unit area to estimate the total population size.