---
title: Ascertain the gases exchanged by trees in the manufacture of their f… — Trees and forests through the year · tree and pragmatics
description: Ascertain the gases exchanged by trees in the manufacture of their food. Exam question 4 of lesson 76 «Trees and forests through the year» of the world course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right.
---

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# Exam question 4 · Trees and forests through the year

<!-- .ven lang=en -->
Ascertain the gases exchanged by trees in the manufacture of their food.

<!-- .vintro -->
**Mova's choice:** option 4 · **The right answer:** option 4 · right ✓ · **Who acts:** you · **What happens:** ascertain, exchange, manufacture · **To what, where:** gases, manufacture, food

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This is exam question 4 of lesson 76 «Trees and forests through the year» of the world 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/world/76-trees-and-forests-through-the-year/#e4).

## The question {#question}

```conllu
# sent_id = question:world:76-trees-and-forests-through-the-year:e4:1
# text = Ascertain the gases exchanged by trees in the manufacture of their food.
1	Ascertain	ascertain	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	gases	gas	NOUN	NNS	Number=Plur	1	obj	_	_
4	exchanged	exchange	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	acl	_	_
5	by	by	ADP	IN	_	6	case	_	_
6	trees	tree	NOUN	NNS	Number=Plur	4	obl	_	_
7	in	in	ADP	IN	_	9	case	_	_
8	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
9	manufacture	manufacture	NOUN	NN	Number=Sing	4	obl	_	_
10	of	of	ADP	IN	_	12	case	_	_
11	their	their	PRON	PRP$	Case=Gen|Number=Plur|Person=3|Poss=Yes|PronType=Prs	12	nmod:poss	_	_
12	food	food	NOUN	NN	Number=Sing	9	nmod	_	SpaceAfter=No
13	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **ascertain** | imperative | you *not said here* | the gases |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent gas=Topic |
| 2 | **exchange** | participle |  | the gases *not said here* |  | the manufacture of trees's food |  | by trees | vn exchange-13.6.1 «NP V NP»: agent=Agent |
| 3 | **manufacture** |  |  | trees's food |  |  |  |  | nom manufacture «act transitive»: of=patient |

<!-- .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 {#o1}

<!-- .ven lang=en -->
Nitrogen is taken in and oxygen given out

```conllu
# sent_id = question:world:76-trees-and-forests-through-the-year:e4:o1:1
# text = Nitrogen is taken in and oxygen given out
1	Nitrogen	nitrogen	NOUN	NN	Number=Sing	3	nsubj:pass	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	taken	take	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	in	in	ADP	RP	_	3	compound:prt	_	_
5	and	and	CCONJ	CC	_	7	cc	_	_
6	oxygen	oxygen	NOUN	NN	Number=Sing	7	nsubj	_	_
7	given	give	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	conj	_	_
8	out	out	ADP	RP	_	7	compound:prt	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **take in** | present · passive |  | Nitrogen |  |  |  |  | vn bring-11.3 «NP V NP»: subject=Theme |
| 2 | **give out** | participle | oxygen |  |  |  |  |  | vn break\_down-45.8 «NP V»: agent=Patient |

### Option 2 {#o2}

<!-- .ven lang=en -->
Oxygen is taken in and carbon dioxide given out

```conllu
# sent_id = question:world:76-trees-and-forests-through-the-year:e4:o2:1
# text = Oxygen is taken in and carbon dioxide given out
1	Oxygen	oxygen	NOUN	NN	Number=Sing	3	nsubj:pass	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	taken	take	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	in	in	ADP	RP	_	3	compound:prt	_	_
5	and	and	CCONJ	CC	_	8	cc	_	_
6	carbon	carbon	NOUN	NN	Number=Sing	7	compound	_	_
7	dioxide	dioxide	NOUN	NN	Number=Sing	8	nsubj	_	_
8	given	give	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	conj	_	_
9	out	out	ADP	RP	_	8	compound:prt	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **take in** | present · passive |  | Oxygen |  |  |  |  | vn bring-11.3 «NP V NP»: subject=Theme |
| 2 | **give out** | participle | carbon dioxide |  |  |  |  |  | vn break\_down-45.8 «NP V»: agent=Patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
Oxygen is taken in and nitrogen given out

```conllu
# sent_id = question:world:76-trees-and-forests-through-the-year:e4:o3:1
# text = Oxygen is taken in and nitrogen given out
1	Oxygen	oxygen	NOUN	NN	Number=Sing	3	nsubj:pass	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	taken	take	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	in	in	ADP	RP	_	3	compound:prt	_	_
5	and	and	CCONJ	CC	_	7	cc	_	_
6	nitrogen	nitrogen	NOUN	NN	Number=Sing	7	nsubj	_	_
7	given	give	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	conj	_	_
8	out	out	ADP	RP	_	7	compound:prt	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **take in** | present · passive |  | Oxygen |  |  |  |  | vn bring-11.3 «NP V NP»: subject=Theme |
| 2 | **give out** | participle | nitrogen |  |  |  |  |  | vn break\_down-45.8 «NP V»: agent=Patient |

### Option 4 · ← Mova's choice · ✓ the right answer {#o4}

<!-- .ven lang=en -->
Carbon dioxide is taken in and oxygen given out

```conllu
# sent_id = question:world:76-trees-and-forests-through-the-year:e4:o4:1
# text = Carbon dioxide is taken in and oxygen given out
1	Carbon	carbon	NOUN	NN	Number=Sing	2	compound	_	_
2	dioxide	dioxide	NOUN	NN	Number=Sing	4	nsubj:pass	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	taken	take	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	in	in	ADP	RP	_	4	compound:prt	_	_
6	and	and	CCONJ	CC	_	8	cc	_	_
7	oxygen	oxygen	NOUN	NN	Number=Sing	8	nsubj	_	_
8	given	give	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	conj	_	_
9	out	out	ADP	RP	_	8	compound:prt	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **take in** | present · passive |  | Carbon dioxide |  |  |  |  | vn bring-11.3 «NP V NP»: subject=Theme |
| 2 | **give out** | participle | oxygen |  |  |  |  |  | vn break\_down-45.8 «NP V»: agent=Patient |

<!-- div src -->

**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.

<!-- /div -->

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