A living thing has multiple levels of
organisation. Each level of organisation has its
own properties, which are not found in its
constituents.
Examples of three tissues supporting the
statements are
(i) Cardiac Muscle Tissue It is a contractile
tissue present only in heart. Cell junctions
fuse the plasma membrane of cardiac muscle
cells and make them stick together. When one
cell receives a signal to contract, its
neighbours also start to contract. It means a
single cell cannot contract, while there are
some fusion points, which allow the cells to
contract as a unit.
(ii) Blood It is a fluid connective tissue. The
individual components of blood, i.e., RBCs,
WBCs and platelets have different properties
but as a unit they make the blood, a tissue
serving many functions.
(iii) Bone It is a hard connective tissue that
forms the framework of the body. The
individual cells inside the bone do not have
this property.