Q. The most abundant element found in plants is : (a) Carbon (b) Nitrogen (c) Iron (d) Manganese Solution : Correct option : A Carbon is one of the macronutrients…
Q. Nitrifying bacteria are : (a) Autotrophs (b) Chemoautotrophs (c) Phototrophs (d) Heterotrophs Solution : Correct option : B Chemosynthetic bacteria are organisms which obtain energy from the oxidation of…
Q. Which is a free living nitrogen fixing bacterium? Pseudomonas Azotobacter Nitrosomonas Rhizobium Solution : Correct option : B Reduction of inert atmospheric nitrogen to ammonia by living organisms is…
Q. Yield of rice is increases by : (a) Sesbania (b) Anabaena (c) Bacillus subtilis (d) B. popillae Solution : Correct option : B Anabaena resides in the fronds of Azolla (…