Categorize the following animals based on the na ture of excretion of nitrogenous waste. Mammals, Bony Fishes , Birds, Aquatic amphibians, Terrestrial amphibians, Insects, Cartilage fishes, Aquatic insects

Classify the following animals according to their type of excretion. Frog, Tadpole, birds, man, Turtle, shark, Insect,

Read the following passage and answer the questions given. The production and improper disposal of waste are causes for a great deal of environmental pollution. Many toxic industrial wastes from manufacturing process require treatment and /or safe disposal. When materials are recycled, apart from saving on the coast of raw material, waste disposal coast are reduced. Some combustible materials like dried leaves etc can be burnt to get heat energy. Sewage treatment includes filtering, scudge settlement, degradation coagulation disinfection using chlorine etc. Certain microorganisms can degrade waste in the absence of oxygen-digestion. Sewage water is purified by: light, Fishes, Microorganisms, Aquatic plants