Explanation:

The 42nd Amendment Act of 1976 added four new Directive Principles to the original list , viz Article 39A, Article 43A and Article 48A.. They require the State:

1. To secure opportunities for healthy development of children (Article 39).

2. To promote equal justice and to provide free legal aid to the poor (Article 39 A).

3. To take steps to secure the participation of workers in the management of industries (Article 43 A).

4. To protect and improve the environment and to safeguard forests and wild life (Article 48 A).