Question Detail The most abundant constituent of atmospheric air is ? OxygenHydrogenCarbonNitrogen Answer: Option D Similar Questions : 1. Which part of eye becomes inflamed and pink when dust gets into it ? ChoroidsCorneaScleroticConjunctiva Answer: Option D 2. Placenta is the structure formed : by fusion of germ layersby foetus onlyby the union of foetal and uterine tissueby uterine only Answer: Option C 3. Diabetes is caused by lack of ? SugarCalciumVitaminInsulin Answer: Option D 4. Photosynthesis generally takes place in which parts of the plant? Steam and leafLeaf and other chloroplast bearing plantsBark and leafRoots and chloroplast bearing plants Answer: Option B 5. Which one of the following is an enzyme ? SomatotropinTrypsinGlucagonInsulin Answer: Option B Read more from - Biology Questions Answers