Final answer:
The lysogenic cycle involves the integration of phage DNA into the host genome. Environmental stress can cause the phage DNA to be excised from the host genome, leading the virus to enter the lytic cycle, where cell lysis and virus production occur.
Step-by-step explanation:
The lysogenic cycle is a process where a temperate bacteriophage's DNA is integrated into the host cell's genome and is referred to as a prophage. This prophage DNA is replicated along with the host's DNA and is passed to new cells during bacterial reproduction. Environmental stressors, such as UV light or toxic chemicals, can trigger the excision of the prophage from the host genome, which is the removal of viral DNA, leading the virus to enter the lytic cycle where active viral replication occurs, resulting in cell lysis and the release of new virus particles.
It is in the lytic cycle, not the lysogenic cycle, where cell lysis and viral particle formation primarily take place. Therefore, if we relate this information to the options provided in the student query, the correct option that describes the excision of viral DNA during the lysogenic cycle is removal of viral DNA from the host's genome.