Uric acid is the chief nitrogenous waste material in the excretory system of:

Explanation

Uric acid is indeed the chief nitrogenous waste material in the excretory system of all these groups: reptiles, birds, and insects. Reptiles: Reptiles, such as snakes, lizards, and turtles, excrete uric acid as their primary nitrogenous waste. This adaptation allows them to conserve water since uric acid can be excreted with minimal water loss. Birds: Birds also excrete uric acid as their primary nitrogenous waste. Like reptiles, this adaptation helps them conserve water, which is crucial for animals that often live in arid environments or have limited access to water. Insects: Insects, such as grasshoppers and beetles, also excrete uric acid. In their case, it serves as an efficient way to remove nitrogenous waste without losing valuable water, which is especially important for insects living in dry habitats. In summary, all of these groups have evolved to excrete uric acid as their main nitrogenous waste, primarily for water conservation purposes in their respective environments.