Which task is the responsibility of the No. 2 cabin crew member concerning the ELS?

The No. 2 cabin crew member is primarily responsible for operating the Emergency Lighting System (ELS) as part of their emergency duties during a flight. In the event of an emergency, the ELS is crucial for ensuring the safety of passengers, aiding in visibility, and guiding passengers to exits. This task is vital because it allows for a prompt response to emergency situations, ensuring that evacuation procedures can be conducted efficiently and safely.

The other responsibilities such as monitoring cabin temperature, recording passenger numbers, and conducting safety briefings are important functions within the overall operations of the cabin crew but do not specifically relate to the management of the ELS. While these tasks contribute to passenger safety and comfort, they are not directly associated with the immediate response required for emergency lighting during an incident.