occurrence problems

Occurrence - Chlorine belongs to the 'halogen' family. All the elements of this family are non-metals. They exhibit similar properties and they all form salts similar to sodium chloride. All the members of the group VII A are highly reactive, and they are not available in nature in the fr..

Occurrence - Noble gases always occur in free state because of their inert nature. All the noble gases, except radon are present in air in small amounts. The relative abundance of the noble gases in air is = 1%. Helium is present in natural gas up to the extent of 10 per cent. It is also ..

It is found in aquatic animal groups like sponges, coelentrates, crustaceans, echinoderms, bony fish, tadpole larvae and salamander. Ammonia is produced as a result of catabolism of proteins, especially in the liver cells by oxidative deamination of excess of amino acids in the presence of oxidase..

Phloem is found in all parts of the plantlike roots, stem and leaves. They occur together with the xylem to form the vascular bundl..

Found in the cortex of root, ground tissue in stems and mesophyll of leave..

Found abundantly in stems of plants like hemp, jute and coconut, their length varying from 1 mm to 550 m..

Generally found in land animals which can afford to excrete sufficient volume of water or to concentrate urea in considerable quantity in the urine. It is commonly found in man, whales, seals, desert mammals like kangaroo rats, camels, toads, frogs, cartilagenous fishes, aquatic and semi aquatic r..

Chlorine belongs to the 'halogen' family. All the elements of this family are non-metals. They exhibit similar properties and they all form salts similar to sodium chloride. All the members of the group VII A are highly reactive, and they are not available in nature in the free state. It can be not..

Methane occurs in: Natural gas Marshy areas where plant matter rots and decomposes. (paddy fields, stagnant ponds) Coal mines Bodies of termites (cellulose digesting insect) Intestines of ruminating animals (animals that chew the cud e.g., cows) Constituent of biogas..

Nitrogen exists in the free and in the combined form in the atmosphere of the earth. In the free state it occupies about 80% by volume of air. In the combined form, it is present as ammonia and all ammonium compounds, in nitric acid and in all nitrates, nitrites and in all living things in th..