---
title: Ascertain the proportion of the land surface of the Earth covered by… — Trees · tree and pragmatics
description: Ascertain the proportion of the land surface of the Earth covered by tropical rainforests. Exam question 4 of lesson 60 «Trees» 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 4 · Trees

<!-- .ven lang=en -->
Ascertain the proportion of the land surface of the Earth covered by tropical rainforests.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **Who acts:** you · **What happens:** ascertain, cover · **To what, where:** proportion, land surface

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This is exam question 4 of lesson 60 «Trees» 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/60-trees/#e4).

## The question {#question}

```conllu
# sent_id = question:biology:60-trees:e4:1
# text = Ascertain the proportion of the land surface of the Earth covered by tropical rainforests.
1	Ascertain	ascertain	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	proportion	proportion	NOUN	NN	Number=Sing	1	obj	_	_
4	of	of	ADP	IN	_	7	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
6	land	land	NOUN	NN	Number=Sing	7	compound	_	_
7	surface	surface	NOUN	NN	Number=Sing	3	nmod	_	_
8	of	of	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	Earth	Earth	PROPN	NNP	Number=Sing	7	nmod	_	_
11	covered	cover	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	7	acl	_	_
12	by	by	ADP	IN	_	14	case	_	_
13	tropical	tropical	ADJ	JJ	Degree=Pos	14	amod	_	_
14	rainforests	rainforest	NOUN	NNS	Number=Plur	11	obl	_	SpaceAfter=No
15	.	.	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 proportion of the land surface of the Earth |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent proportion=Topic |
| 2 | **cover** | participle |  | the land surface of the Earth *not said here* |  |  |  | by tropical rainforests | vn fill-9.8-1 «NP V NP»: agent=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 -->
Approximately one half

```conllu
# sent_id = question:biology:60-trees:e4:o1:1
# text = Approximately one half
1	Approximately	approximately	ADV	RB	_	2	advmod	_	_
2	one	one	NUM	CD	NumForm=Word|NumType=Card	3	nummod	_	_
3	half	half	NOUN	NN	Number=Sing|NumForm=Word|NumType=Frac	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
Approximately six per cent

```conllu
# sent_id = question:biology:60-trees:e4:o2:1
# text = Approximately six per cent
1	Approximately	approximately	ADV	RB	_	2	advmod	_	_
2	six	six	NUM	CD	NumForm=Word|NumType=Card	4	nummod	_	_
3	per	per	NOUN	NN	Number=Sing	4	compound	_	_
4	cent	cent	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 3 {#o3}

<!-- .ven lang=en -->
Approximately one per thousand

```conllu
# sent_id = question:biology:60-trees:e4:o3:1
# text = Approximately one per thousand
1	Approximately	approximately	ADV	RB	_	3	advmod	_	_
2	one	one	NUM	CD	NumForm=Word|NumType=Card	3	nummod	_	_
3	per	per	NOUN	NN	Number=Sing	0	root	_	_
4	thousand	thousand	NUM	CD	NumForm=Word|NumType=Card	3	flat	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 {#o4}

<!-- .ven lang=en -->
Approximately ninety per cent

```conllu
# sent_id = question:biology:60-trees:e4:o4:1
# text = Approximately ninety per cent
1	Approximately	approximately	ADV	RB	_	2	advmod	_	_
2	ninety	ninety	NUM	CD	NumForm=Word|NumType=Card	4	nummod	_	_
3	per	per	NOUN	NN	Number=Sing	4	compound	_	_
4	cent	cent	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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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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- ← previous: [Trees, exam 3](https://md.mova.elamur.ai/free/en/corpora/questions/biology/60-trees/e3/)
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