Kerala on Wednesday raised serious apprehensions on the effectiveness of the proposed national food security law as it could remove large number of poor families from the beneficiary list besides putting enormous financial burden on the state. Shibu Baby John, food and civil supplies minister, Kerala said the centre must apply separate socio-economic critieria for choosing beneficiaries under the Targeted Public Distribution System (TPDS) as because of better human index of the state, many families could be deprived from getting benefits of subsidised grain.