# Great Migrations: answers and explanations

Cambridge IELTS 11, Test 3, Reading Passage 2

Source: Passage, questions and answer key from Cambridge IELTS 11, Test 3, Reading Passage 2. © Cambridge University Press & Assessment. Used for educational practice. Explanations and evidence notes are written by Testmigo.

## Answer key

| Q | Answer | Proof |
| --- | --- | --- |
| 14 | FALSE | While local gulls will dive voraciously for such handouts, the tern flies on. |
| 15 | TRUE | biologists define it differently, depending in part on what sorts of animals they study |
| 16 | NOT GIVEN | So can the movement of aphids when, having depleted the young leaves on one food plant |
| 17 | TRUE | aphids will become sensitive to blue light (from the sky) when it's time for takeoff |
| 18 | FALSE | it focuses attention on what the phenomenon of wildebeest migration shares with the phenomenon of the aphids |
| 19 | G | they tend to be linear, not zigzaggy |
| 20 | C | they involve special behaviours concerning preparation (such as overfeeding) ... Birds will fatten themselves with heavy feeding in advance of a long migrational flight. |
| 21 | A | undeterred by challenges that would turn other animals aside |
| 22 | E | The arctic tern resists distraction because it is driven at that moment by an instinctive sense |
| 23 | speed | dependent on distance vision and speed to keep safe from predators |
| 24 | plains | across a river, and down onto the plains. Here they wait out the frozen months |
| 25 | bottlenecks | the severity of its constriction at three bottlenecks |
| 26 | corridor | leaving a corridor of open ground only about 150 metres wide, filled with private homes |

## Why these answers are right

**14. FALSE.** The statement says gulls and terns react the same way to offered food. Paragraph B contrasts them: local gulls dive greedily for handouts, while the migrating tern ignores the herring and flies on. Their behavior is opposite, so the answer is FALSE.

**15. TRUE.** The statement claims experts' definitions vary with their field. Paragraph D says biologists define migration differently depending partly on the animals they study, and gives Berger's work on large mammals as an example. This matches the statement, so it is TRUE.

**16. NOT GIVEN.** The statement says very few experts accept aphid movement as migration. Paragraph E simply says aphid movement can also be considered migration, and no source reports how many experts agree or disagree. The level of agreement is never given, so the answer is NOT GIVEN.

The why and the trap for questions 17 onwards are free with an account on the [answers page](https://testmigo.com/ielts/reading/great-migrations/answers).

[Practice Great Migrations](https://testmigo.com/ielts/reading/great-migrations)