5. In the case of the root tip, some of the new cells formed by the root meristem are used to replace cells of the root cap which are worn out the root grows into the soil. In the case of the shoot tip, some of the cells formed by the shoot meristem give rise to leaf primordia (singular primordium) which will grow to become leaves. 6. The rest of the new cells are added to the zone of elongation. As new cells are being formed, the cells which have been formed earlier are pushhed to the zone of cell elongation.