Which of the following is a/are feature/features of zoological parks?

The correct option is All of the above.

Let us analyze the features of zoological parks (zoos) one by one:
1. Protected Environment: Zoological parks are designated areas where wild animals are kept in a protected environment under human care. This protection helps safeguard them from threats like poaching, habitat destruction, and predators, while ensuring they receive proper food, medical attention, and shelter.
2. Studying Behaviour: Keeping animals in these controlled environments allows researchers, biologists, and the general public to observe and study their natural behaviours, social interactions, and daily activities.
3. Learning Food Habits: Observing animals in zoological parks also provides valuable insights into their dietary requirements, feeding habits, and nutritional preferences.
Since all three statements accurately describe the key features and purposes of zoological parks, the correct choice is indeed "All of the above".