Read the excerpt:
Desert locusts are usually solitary insects that live quietly in dry areas. After heavy rains, however, plants grow quickly and the locusts multiply. When they become crowded, their behaviour and even their colour change: they begin to move together in huge swarms that can travel more than one hundred kilometres a day. A large swarm can eat as much food in a day as several million people, so early warning, based on watching rainfall and breeding areas, is essential for farmers across North Africa and the Middle East.
According to the excerpt, what happens when desert locusts become crowded?
Answer and explanation
Correct answer: A. They start to travel in large groups
- Step 1: The excerpt says that when they become crowded "they begin to move together in huge swarms". Answer: They start to travel in large groups. Why not the others: The excerpt says the swarms eat huge amounts, not that they stop feeding; egg numbers are not mentioned; and living alone is how locusts behave before they become crowded.
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