More primers are used in lagging strand synthesis than in leading strand synthesis.

The DNA replication on lagging strand is discontinuous.

Explanation:

The DNA replication occurs in 5' to 3' direction. The leading strand allows replication in the same direction but the lagging strand does not allows replication in the same direction that is 5' to 3' direction. Thus the synthesis occurs in small fragments called Okazaki fragments. So, more primers are required on lagging strand.