Hardness of water is due to calcium and magnesium ions. when soap is added to hard water, calcium and magnesium ions replaces sodium (or potassium) ions in the salt (soap) and gets precipitated hence lather formation is hindered.
A plant that has a taproot system and has several growth rings and that is evident by the cross-section of the stem and has a layer that is a type of bark and is referred to as an angiosperm.
It has about three to four parts of multiple vascular rings and columns in the stems.
