---
title: Identify the principal function of the alveoli of the lungs. — Lungs and breathing · tree and pragmatics
description: Identify the principal function of the alveoli of the lungs. Exam question 1 of lesson 66 «Lungs and breathing» of the biology course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wrong.
---

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# Exam question 1 · Lungs and breathing

<!-- .ven lang=en -->
Identify the principal function of the alveoli of the lungs.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **Who acts:** you · **What happens:** identify · **To what, where:** principal function

<!-- .vabout -->
This is exam question 1 of lesson 66 «Lungs and breathing» of the biology course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/biology/66-lungs-and-breathing/#e1).

## The question {#question}

```conllu
# sent_id = question:biology:66-lungs-and-breathing:e1:1
# text = Identify the principal function of the alveoli of the lungs.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
3	principal	principal	ADJ	JJ	Degree=Pos	4	amod	_	_
4	function	function	NOUN	NN	Number=Sing	1	obj	_	_
5	of	of	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	alveoli	alveolus	NOUN	NNS	Number=Plur	4	nmod	_	_
8	of	of	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	lungs	lung	NOUN	NNS	Number=Plur	7	nmod	_	SpaceAfter=No
11	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* | the principal function of the alveoli of the lungs |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent function=Theme |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
The filtration of dust from inspired air

```conllu
# sent_id = question:biology:66-lungs-and-breathing:e1:o1:1
# text = The filtration of dust from inspired air
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	filtration	filtration	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	dust	dust	NOUN	NN	Number=Sing	2	nmod	_	_
5	from	from	ADP	IN	_	7	case	_	_
6	inspired	inspired	ADJ	JJ	Degree=Pos	7	amod	_	_
7	air	air	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **filter** |  | dust |  |  | inspired air |  |  | nom filtration «process intransitive»: of=agent from=place |

### Option 2 {#o2}

<!-- .ven lang=en -->
The storage of food reserves for the body

```conllu
# sent_id = question:biology:66-lungs-and-breathing:e1:o2:1
# text = The storage of food reserves for the body
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	storage	storage	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	food	food	NOUN	NN	Number=Sing	5	compound	_	_
5	reserves	reserve	NOUN	NNS	Number=Plur	2	nmod	_	_
6	for	for	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	body	body	NOUN	NN	Number=Sing	5	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **store** |  |  | food reserves for the body |  |  |  |  | nom storage «act transitive»: of=patient |

### Option 3 · ✓ the right answer {#o3}

<!-- .ven lang=en -->
The exchange of oxygen and carbon dioxide

```conllu
# sent_id = question:biology:66-lungs-and-breathing:e1:o3:1
# text = The exchange of oxygen and carbon dioxide
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	exchange	exchange	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	oxygen	oxygen	NOUN	NN	Number=Sing	2	nmod	_	_
5	and	and	CCONJ	CC	_	7	cc	_	_
6	carbon	carbon	NOUN	NN	Number=Sing	7	compound	_	_
7	dioxide	dioxide	NOUN	NN	Number=Sing	2	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **exchange** |  |  | oxygen |  |  |  |  | nom exchange «phenomenon transitive»: of=patient |

### Option 4 {#o4}

<!-- .ven lang=en -->
The production of the voice by vibration

```conllu
# sent_id = question:biology:66-lungs-and-breathing:e1:o4:1
# text = The production of the voice by vibration
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	production	production	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	voice	voice	NOUN	NN	Number=Sing	2	nmod	_	_
6	by	by	ADP	IN	_	7	case	_	_
7	vibration	vibration	NOUN	NN	Number=Sing	5	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **produce** |  |  | the voice by vibration |  |  |  |  | nom production «act transitive»: of=patient |

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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