Question

Give reason I]silver chloride solution should be store d in coloured bottles Ii]multicellular organisms have special respiratory system Ii]iron articles are painted Iii] trachea is provided with cartilaginous rings

Answer 1

Iron articles are painted because paint prevent iron from getting rust into it. If it get rusted the the iron will no longer be in good condition.

It is to maintain the shape of trachea and keep it hollow. Also can be explained as when we breathe out a partial vaccuum is created and the cartilage rings prevent the trachea from collapsing.

beacuse silver chloride reacts with sunlight to form silver and chlorine gas . so to prevent it from chaniging its form it is stored in a dark bottle