Into what type of object is a practitioner required to put any disposable objects that have come in contact with blood?

The correct answer is a sealed plastic bag, as it provides a hygienic way to dispose of any disposable objects that have come into contact with blood. This method is crucial for ensuring that potentially infectious materials are contained and do not pose a risk to anyone else. A sealed plastic bag can effectively prevent spills and keeps the waste secure until it can be disposed of properly, in compliance with health and safety regulations.

Other options do not offer the same level of safety and cleanliness. Recyclable containers, for instance, are not appropriate for biomedical waste because they are not designed to handle hazardous materials. An open cardboard box lacks the necessary containment and could easily spill or allow exposure to the contents. A glass jar, while it provides a sturdy container, poses a risk of breakage and injury when handling, and is not suitable for the disposal of sharp or potentially infectious materials.