The adaptive importance of the nuptial flight from termite colonies is to

Analyze the question: It asks for the adaptive importance (the survival or evolutionary benefit to the termites) of the nuptial flight, in which winged reproductives (alates) leave the colony, usually at the start of the rains.

Concept: Termites live in colonies with a caste system: workers, soldiers, and reproductives (king and queen, plus winged alates). The winged males and females are produced in large numbers at certain times of year. They leave the parent colony in the nuptial flight, then:

1. They fly away from the parent nest (dispersal).
2. They pair up and shed their wings.
3. Each pair finds a suitable site, digs in, and founds a new colony.

So the main purpose is dispersal for founding new colonies, which extends the species' range and ensures its survival.

Evaluating the options:

• A. Ensure cross-breeding between colonies. Cross-breeding does happen as a side effect, but it is not the main adaptive importance. The flight exists to start new colonies.
• B. Disperse the reproductives in order to establish new colonies. This is the primary function of the flight.
• C. Provide food for birds and other animals. This is a consequence of the flight, not a benefit to the termites. Many alates are lost to predators.
• D. Expel reproductives so there is enough food for others. Reproductives are not expelled to save food. They leave to found new colonies.

Answer: B

Tip: For "adaptive importance" questions, choose the option that benefits the organism's own survival or reproduction, not a side effect such as feeding predators. Remember the key phrase: nuptial flight = dispersal and new colony formation.