1. Large number counts are needed. If you are looking for rare events and
extraordinary occurrences or you need to get a survey on large, more ore less
heterogeneous populations: The number often makes the difference. Large numbers
of plants have to be screened to establish correlations between genes and
phenotypes or genes and reactions on external stressors. Furthermore, such
information is needed to prove the reliability of theoretical models that have now
reached a high complexity.