The Chennai Corporation on Wednesday distributed prizes to five NGOs — World Vision, Exnora, Palam, Mugavari and Nallor Vattam — for their contribution to the city. The civic body also distributed prizes to 45 residents’ associations for maintaining clean localities. The corporation also honoured citizens aged over 100. Prizes for rooftop gardening and sports competitions were distributed during the event to mark the 66th birthday of chief minister J Jayalalithaa.