Which field method uses long rectangular plot?
Quadrat methods employ square plots for sessile organisms, while transect approach samples along environmental gradient like altitude or moisture. Line transect specifically uses long rectangular belt often tens or hundreds of meters length with limited width to record species occurring along line and estimate density and distribution changes. Grid mapping overlays systematic squares for territory mapping, radar survey uses remote electromagnetic waves. Long rectangular design allows efficient interception of mobile animals and transition zones, generating encounter rates and percent cover data across habitats for field ecologists.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.