natural resources case study questions for class 9 science

Case Study/Passage Based Questions: Question 1: At present the primary nutrient which limits the agricultural yield is nitrogen (N). Some plants are capable to produce more N2 than they consume. These plants show symbiotic relationship with N2-fixing bacteria such as Rhizobium.These bacteria produce root nodules in leguminous plants and convert atmospheric N2 into nitrogenous compounds. … Read more