Part Sixteen of the Constitution of India

Part XVI of the Constitution of India establishes that certain castes and tribes shall be represented in the Lok Sabha (the lower house in India's bicameral legislature) in proportion to their population--that is, if the specified caste makes up 20% of the population in a given province, at least 20% of that province's members of the Lok Sabha must be of that caste. The Constitution specifies that this is to be accomplished "as nearly as may be", accepting that due to limited delegation size proportions may not always match exactly.