---
title: Air and why we need it — the lesson's questions with trees and pragmatics · World
description: The 17 test and exam questions of lesson 17 «Air and why we need it» of the world course of Mova's primary school, each with its options, Mova's choice and the right answer, every sentence with its dependency tree and pragmatics.
---

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# Air and why we need it

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The 17 questions of lesson 17 «Air and why we need it» of the world course of Mova's primary school with their options, 86 sentences, every one parsed by Mova with its syntax tree and pragmatics. How the student did on them: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/world/17-air-oxygen-carbon-dioxide/).

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- [t1](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t1/) — If all green plants disappeared, what would slowly happen to the air? — wrong ✗ · ★
- [t2](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t2/) — Why does blowing gently on a dying campfire make it burn brighter? — wrong ✗ · ★
- [t3](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t3/) — Which is true about the air you breathe out? — right ✓ · ★
- [t4](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t4/) — Why is it hard to run fast near the top of a very high mountain? — wrong ✗ · ★
- [t5](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t5/) — A water plant grows in a goldfish bowl near a window. How does it help the fish? — wrong ✗ · ★
- [t6](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t6/) — Which shows that air takes up space? — wrong ✗ · ★
- [t7](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t7/) — Why must a car engine have air coming in? — right ✓ · ★
- [t8](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t8/) — Which gas do both a candle flame and a person need? — right ✓ · ★
- [t9](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t9/) — Which list goes from the most to the least in the air? — wrong ✗ · ★
- [t10](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t10/) — what's air actually made of mostly — wrong ✗ · ★
- [t11](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t11/) — why's the candle go out when u put a jar over it — wrong ✗ · ★
- [t12](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t12/) — Mia says air is mostly oxygen. true? — right ✓ · ★
- [t13](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t13/) — my brother says the air u breathe out has no oxygen left. right? — wrong ✗ · ★
- [e1](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/e1/) — State the approximate proportion of the air composed of oxygen. — wrong ✗ · exam
- [e2](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/e2/) — Identify the principal constituent gas of the atmosphere. — wrong ✗ · exam
- [e3](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/e3/) — Select the response that is consistent with the established facts concerning exhaled air. — wrong ✗ · exam
- [e4](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/e4/) — Whereas a fire is deprived of oxygen, determine the consequence. — wrong ✗ · exam

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