Why is it necessary to study India's mainland and island parts separately?

Correct answer: Because islands separately add to total extent and coastline

The geographical concept here is the distinction between mainland dimensions and the dimensions of the entire national territory. India includes a continuous mainland as well as island groups such as the Andaman and Nicobar Islands and Lakshadweep. Islands can extend the country’s southernmost reach, add separate coastal segments and affect calculations of total coastline and maritime location. Therefore, studying the mainland alone and then studying the complete territory gives a more accurate understanding of India’s size and extent; option A is correct. Option B is false because the islands are integral parts of India. Option C is irrelevant and incorrectly treats the mainland as unrelated to surrounding seas. Option D is false because islands may have varied physical forms and are not defined as only mountains. Separate study improves geographical accuracy rather than denying national unity.