Question Detail Placenta is the structure formed : by fusion of germ layersby foetus onlyby the union of foetal and uterine tissueby uterine only Answer: Option C Similar Questions : 1. Healing of wounds is hastened by vitamin ? CAED Answer: Option A 2. The most abundant constituent of atmospheric air is ? OxygenHydrogenCarbonNitrogen Answer: Option D 3. Human blood is a viscous fluid due to Platelets in plasmaProteins in bloodRBC and WBC in bloodSodium in serum Answer: Option B 4. Diabetes is caused by lack of ? SugarCalciumVitaminInsulin Answer: Option D 5. Milk is poor source of CalciumIronCopperSodium Answer: Option B Read more from - Biology Questions Answers