---
title: A koala eats only eucalyptus leaves; a fox eats mice, berries and in… — Balance in a food web · tree and pragmatics
description: A koala eats only eucalyptus leaves; a fox eats mice, berries and insects. Which is in more danger if one of its foods disappears? Test 7 · ★★★ of lesson 30 «Balance in a food web» of the world course of Mova's primary school, with the dependency tree and pragmatics of the question and of each optio
---

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# Test 7 · ★★★ · Balance in a food web

<!-- .ven lang=en -->
A koala eats only eucalyptus leaves; a fox eats mice, berries and insects. Which is in more danger if one of its foods disappears?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** koala, fox, one · **What happens:** eat, be, disappear · **To what, where:** eucalyptus leaves, mice, more danger

<!-- .vabout -->
This is test 7 · ★★★ of lesson 30 «Balance in a food web» of the world course of Mova's primary school. 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/30-balance-in-food-webs/#t7).

## The question {#question}

<!-- .note -->
*Sentence 1:* A koala eats only eucalyptus leaves; a fox eats mice, berries and insects.

```conllu
# sent_id = question:world:30-balance-in-food-webs:t7:1
# text = A koala eats only eucalyptus leaves; a fox eats mice, berries and insects.
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	koala	koala	NOUN	NN	Number=Sing	3	nsubj	_	_
3	eats	eat	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	only	only	ADV	RB	_	6	advmod	_	_
5	eucalyptus	eucalyptus	NOUN	NN	Number=Sing	6	compound	_	_
6	leaves	leaf	NOUN	NNS	Number=Plur	3	obj	_	SpaceAfter=No
7	;	;	PUNCT	:	_	10	punct	_	_
8	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	_	_
9	fox	fox	NOUN	NN	Number=Sing	10	nsubj	_	_
10	eats	eat	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
11	mice	mouse	NOUN	NNS	Number=Plur	10	obj	_	SpaceAfter=No
12	,	,	PUNCT	,	_	13	punct	_	_
13	berries	berry	NOUN	NNS	Number=Plur	11	conj	_	_
14	and	and	CCONJ	CC	_	15	cc	_	_
15	insects	insect	NOUN	NNS	Number=Plur	11	conj	_	SpaceAfter=No
16	.	.	PUNCT	.	_	3	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **eat** | present | a koala | eucalyptus leaves |  |  |  |  | vn eat-39.1-1 «NP V NP»: agent=Agent leaf=Patient |
| 2 | **eat** | present | a fox | mice and berries and insects |  |  |  |  | vn eat-39.1-1 «NP V NP»: agent=Agent mouse=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.

<!-- .note -->
*Sentence 2:* Which is in more danger if one of its foods disappears?

```conllu
# sent_id = question:world:30-balance-in-food-webs:t7:2
# text = Which is in more danger if one of its foods disappears?
1	Which	which	PRON	WDT	PronType=Rel	5	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
3	in	in	ADP	IN	_	5	case	_	_
4	more	more	ADJ	JJR	Degree=Cmp	5	amod	_	_
5	danger	danger	NOUN	NN	Number=Sing	0	root	_	_
6	if	if	SCONJ	IN	_	11	mark	_	_
7	one	one	NUM	CD	NumForm=Word|NumType=Card	11	nsubj	_	_
8	of	of	ADP	IN	_	10	case	_	_
9	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	10	nmod:poss	_	_
10	foods	food	NOUN	NNS	Number=Plur	7	nmod	_	_
11	disappears	disappear	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	advcl	_	SpaceAfter=No
12	?	?	PUNCT	.	_	5	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present |  |  |  | more danger |  |  | tree rules |
| 2 | **disappear** *a condition, not said to happen* | present | one of danger's foods |  |  |  |  |  | vn disappearance-48.2-1 «NP V»: agent=Theme |

## The options {#options}

### Option 1 · ← Mova's choice · ✓ the right answer {#o1}

<!-- .ven lang=en -->
The koala

```conllu
# sent_id = question:world:30-balance-in-food-webs:t7:o1:1
# text = The koala
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	koala	koala	NOUN	NN	Number=Sing	0	root	_	_
```

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

### Option 2 {#o2}

<!-- .ven lang=en -->
The fox

```conllu
# sent_id = question:world:30-balance-in-food-webs:t7:o2:1
# text = The fox
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	fox	fox	NOUN	NN	Number=Sing	0	root	_	_
```

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

### Option 3 {#o3}

<!-- .ven lang=en -->
Both the same

```conllu
# sent_id = question:world:30-balance-in-food-webs:t7:o3:1
# text = Both the same
1	Both	both	CCONJ	CC	_	3	cc:preconj	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	same	same	ADJ	JJ	Degree=Pos	0	root	_	_
```

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

### Option 4 {#o4}

<!-- .ven lang=en -->
Neither of them

```conllu
# sent_id = question:world:30-balance-in-food-webs:t7:o4:1
# text = Neither of them
1	Neither	neither	DET	DT	PronType=Neg	0	root	_	_
2	of	of	ADP	IN	_	3	case	_	_
3	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	1	nmod	_	_
```

<!-- .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: [Balance in a food web, test 6](https://md.mova.elamur.ai/free/en/corpora/questions/world/30-balance-in-food-webs/t6/)
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