Which of the following are primary and secondary data?
Collection of the data about enrollment of students in your school for a period from 2001 to 2010

Which of the following are primaryt and secondary data ? (i) Collection of the data about enrollment of students in your school for a period from 2001 to 2010. (ii) Height of students in your class recorded by physical education teacher.

Which of the following are primary and secondary data? Height of students in your class recorded by physical education teacher.

Which of the following are sets? The collection of teachers in a school .

Which of the following acts as a primary as well a secondary consumer in the forest eco-system?

Which one of the following acts as primary as well as secondary consumer in the forest ecosystem?

Prepare a table on adaptations of the desert animal collect the data form your school library?

Collect information about biogas production from your school library.

Discuss with your teacher or collect the information about electrolysis method form your school library books.

Collect information related to feeling and hunger from your school library and prepare a note on it .

The following data re obtained from the decomposition of a gaseous compound The order of the reaction is