Which of the following is a good practice to be followed?

(i) Cooking oil and paint should not be thrown down a drain.

(ii) Used tea leaves, solid food, and cotton should not be thrown in the drain.

(iii) Plastic waste should not be thrown in the ocean

All three statements are good practices that should be followed:

(i) Cooking oil and paint should not be thrown down a drain because they can solidify and clog the pipes, leading to blockages and other plumbing problems. Instead, they can be disposed of in a separate container and taken to a recycling center or a hazardous waste facility.

(ii) Used tea leaves, solid food, and cotton should not be thrown in the drain because they can also cause blockages and clogs in the pipes. Instead, they can be disposed of in a compost bin or a trash can.

(iii) Plastic waste should not be thrown in the ocean because it can harm marine life and the environment. It is important to properly dispose of plastic waste in a recycling bin or a trash can.