Final answer:
Quadrants and transects are sampling techniques used to study populations in biology. Quadrants are used to count individuals within their boundaries in immobile organisms or very small and slow-moving organisms, while transects involve sampling a linear path. They have different purposes depending on the characteristics of the organisms being studied.
Step-by-step explanation:
Quadrants and transects are sampling techniques used to study populations in biology. Quadrants, such as wood, plastic, or metal squares, are used to count the number of individuals within their boundaries in immobile organisms or very small and slow-moving organisms. This method provides an estimate of both population size and density. Transects, on the other hand, involve sampling a linear path and recording the organisms encountered. This method is commonly used in ecology to study the distribution of organisms in an area. Both techniques have different purposes and are used depending on the characteristics of the organisms being studied.