Step 1: Understanding Biotic and Abiotic Resources
Resources are classified into biotic and abiotic categories. Biotic resources are those that are derived from living organisms, while abiotic resources are non-living, such as minerals and rocks.
Step 2: Identifying Biotic Resources
Fisheries, which include fish and other marine organisms, are biotic resources because they are living organisms.
Step 3: Conclusion
Iron, copper, and rocks are all examples of abiotic resources as they are non-living. Thus, fisheries is the correct example of a biotic resource.
The correct answer is option (C).
Find the unknown frequency if 24 is the median of the following frequency distribution:
\[\begin{array}{|c|c|c|c|c|c|} \hline \text{Class-interval} & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 \\ \hline \text{Frequency} & 5 & 25 & 25 & \text{$p$} & 7 \\ \hline \end{array}\]
Two concentric circles are of radii $8\ \text{cm}$ and $5\ \text{cm}$. Find the length of the chord of the larger circle which touches (is tangent to) the smaller circle.