Step 1: Overview of Black Soil
Black soil is rich in minerals and moisture-retentive, making it ideal for growing certain crops. This soil is commonly found in regions like Maharashtra, Madhya Pradesh, and parts of Tamil Nadu.
Step 2: Cotton as the Correct Crop
Cotton is the primary crop grown in Black soil due to its suitability for the moisture-retentive nature of Black soil, which supports cotton plants. It is often referred to as "Regur Soil."
Step 3: Why the other options are incorrect
- (A) Rubber: Rubber is generally grown in tropical climates and is not suitable for Black soil.
- (B) Maize: While maize can be grown in a variety of soils, it is not primarily associated with Black soil.
- (D) Rice: Rice is typically grown in alluvial soil, especially in floodplains and is not the primary crop for Black soil.
Thus, the correct answer is option (C) Cotton.
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.