Sampling Organisms Flashcards

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Note: We may include questions that have multiple correct answers. It’s useful to remember specific examples to understand these concepts better.

What are abiotic factors and give three examples?

Abiotic factors are non-living elements that affect organisms.

Examples include temperature, light intensity, and levels of moisture.

What is sampling in the context of ecology?

Sampling is a method used to estimate the number of organisms in a population by observing a small section, or sample, and drawing conclusions about the rest.

What is a quadrat and how is it used in sampling?

A quadrat is a square frame (typically 0.25 m2 or 1 m2) used to count and identify plants or slow-moving animals within it.

It is placed randomly to avoid bias, and multiple samples are taken to estimate population size.

How can scientists ensure that quadrat placement is random?

Scientists can convert the sampling area into a grid format and use a random number generator to select random coordinates for quadrat placement.

What is a transect and when is it used?

A transect is a straight line (made with string or measuring tape) placed across a habitat to study changes in physical conditions.

Quadrats are placed at regular intervals along the transect to record species type and number.

How do scientists use the quadrat method to estimate population size?

Scientists place quadrats randomly, count the organisms within each quadrat, repeat this process multiple times, and then use the collected data to estimate the population size using a specific equation.

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