In recent years it has been discovered that different types of aboveground insects develop slowly if they feed on plants that also have subterranean insects and 'vice versa (反之亦然). It seems that a mechanism (机制) has developed through natural selection,
which helps the subterranean and aboveground insects to communicate with each other. This avoids unnecessary competition.
Through the "green telephone lines", subterranean insects can also communicate with a third party, namely the natural enemy of caterpillars (毛虫). Parasitic wasps (寄生蜂) lay their eggs inside aboveground insects. The wasps also benefit from the signals sent by the leaves, as these help them find more insects for their eggs.
The communication between subterranean and above- ground insects has only been studied in a few systems. It is still not clear how widespread this phenomenon is, say the researchers.
1. How do subterranean and aboveground insects communicate with each other?
A. By sending signals through the leaves.
B. By giving off particular smells.
C. By making soft and beautiful sounds.
D. By the signals sent by parasitic wasps.
2. After finding a plant occupied by root-eating insects, aboveground insects will usually ________.
A. send out warning signals
B. compete for the same plant
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