Which term describes a frame of known area used to sample organisms that do not move?

Which term describes a frame of known area used to sample organisms that do not move?

• A. Quadrat
• B. Quota
• C. Rainwater harvesting
• D. Reservoir

Answer: (A)

Using a quadrat means using a square frame of known area to sample organisms that do not move. Because the area inside the frame is known, you can count how many organisms are inside and calculate density as a number per unit area, then extrapolate to larger parts of the habitat. This approach works well for plants, lichens, or other fixed organisms, since they stay in place long enough to be counted within the frame. The other terms aren’t about sampling frames: a quota is a limit on catches, while rainwater harvesting and a reservoir are water-management terms.

Using a quadrat means using a square frame of known area to sample organisms that do not move. Because the area inside the frame is known, you can count how many organisms are inside and calculate density as a number per unit area, then extrapolate to larger parts of the habitat. This approach works well for plants, lichens, or other fixed organisms, since they stay in place long enough to be counted within the frame. The other terms aren’t about sampling frames: a quota is a limit on catches, while rainwater harvesting and a reservoir are water-management terms.