Which of the following is an acceptable guiding factor for developing science text books for a country like India?
1
Illustrative example should only be drawn from the life experiences of children belonging to families of middle income groups
2
There should be a single textbook for the entire country to ensure parity and avoid confusion
3
It should always be borne in mind that textbooks are essentially meant for teachers usage
4
There should be opportunities for learners to appreciate how the concepts of science evolve with time