Solution:

1. Information of attendance of every student collected by visiting every class in a school:
   Primary Data
2. The information of heights of students was gathered from school records and sent to the head office, as it was to be sent urgently:
   Secondary Data
3. In the village Nandpur, the information collected from every house regarding students not attending school:
   Primary Data
4. For science project, information of trees gathered by visiting a forest:
   Primary Data