Which of the following statements about cell junctions are correct ?
(i) All the cells of the epithelium are held together with little intercellular materials
(ii) In almost all animal tissues specialised junctions provide both structural and functional link between their individual cells
(iii) Tight junctions prevent substances from leaking across a tissue
(iv) Adhering junctions provide cementing to keep neighbouring cells together
(v) Gap junction provide cytoplasmic channels between cells for passage of ions, small molecules and sometimes big molecules.