Q1: Base suspension fertiliser essentially contains

ANS:A - 13% N₂ and 43% P₂O₅

Base suspension fertilizer typically contains 43% N2 and 13% P2O5. Base suspension fertilizers are commonly used in agriculture to provide essential nutrients to crops. These fertilizers typically contain nitrogen (N), phosphorus pentoxide (P2O5), and potassium oxide (K2O), along with other micronutrients. In the case of the given options, the composition 43% N2 and 13% P2O5 aligns with the typical nutrient composition of base suspension fertilizers. Nitrogen is essential for plant growth and is often present in relatively high concentrations in fertilizers. Phosphorus (as P2O5) is also crucial for plant development, particularly in promoting root growth and flowering. Therefore, a base suspension fertilizer with 43% nitrogen and 13% phosphorus pentoxide (P2O5) content is commonly used to supply these essential nutrients to crops.