The adaptive importance of nuptial flight from termite colonies is to

Step 1: Analyze the question The question asks about the adaptive importance of the nuptial flight, meaning how it helps the termite species survive and reproduce.

Step 2: Explain the concept Termites live in colonies with a caste system: workers, soldiers, and reproductives (kings and queens). At the start of the rainy season, winged reproductives (alates) leave the mature colony in a mass flight called the nuptial flight. After the flight they:

• land and shed their wings,
• pair up,
• dig into the soil and found a new colony.

So the flight is mainly a dispersal mechanism for starting new colonies, which also reduces overcrowding and competition within the parent colony.

Step 3: Evaluate each option

• A. Disperse the reproductives in order to establish new colonies: Correct. This is the main biological purpose of the flight.
• B. Provide abundant food for birds and other animals: Birds and other animals do feed on the alates, but that is a side effect (and a cost to the termites), not the adaptive purpose.
• C. Ensure cross-breeding between members of one colony and another: This is a plausible secondary benefit, since mixing alates from different colonies can reduce inbreeding. But the primary adaptive importance is dispersal and colony founding, and C is not the best answer.
• D. Expel the reproductives so as to provide enough food for other members: Wrong. The flight is not about food shortage or expulsion.

Step 4: Answer The correct option is A.

Tip: In "adaptive importance" questions, choose the option that describes the direct benefit to the organism's survival or reproduction, not a side effect such as feeding predators. For termites, remember: nuptial flight = dispersal + new colonies.