Explanation: Rajasthan, the largest state in India by area, is known for its vast deserts and arid climate. The state's climate is predominantly hot and dry, with temperatures often exceeding 40°C during the summer months. The Thar Desert, also known as the Great Indian Desert, covers a significant portion of Rajasthan and is one of the reasons for its low population density.
The climate in Rajasthan is characterized by high temperatures and low rainfall, which makes it challenging for agriculture and human habitation. The state receives an average annual rainfall of around 600 mm, which is much lower than the national average. This arid climate limits the availability of water resources, making it difficult to sustain large populations.
In contrast, other states like Karnataka and Maharashtra have more moderate climates. Karnataka has a mix of tropical and semi-arid conditions, with significant rainfall during the monsoon season, which supports agriculture and human habitation. Maharashtra, with its diverse climate ranging from tropical in the coastal regions to semi-arid in the interior, also supports a higher population density due to its varied climatic conditions and urban centers.
The impact of climate on population density is a significant factor in understanding the distribution of human settlements across India. Rajasthan's harsh climate and limited water resources make it less suitable for dense human habitation, resulting in a lower population density compared to other states. This understanding is crucial for students studying geography and demography, as it highlights the relationship between environmental conditions and human settlement patterns.
In summary, Rajasthan's hot and dry climate, particularly the presence of the Thar Desert, contributes to its low population density, making it the correct answer to the question.