---
title: At a zoo dark house, children walk with eyes shut and bump into the… — Echolocation: how bats see with sound · tree and pragmatics
description: At a zoo dark house, children walk with eyes shut and bump into the walls, while the bats fly freely. Why? Test 5 · ★★ of lesson 229 «Echolocation: how bats see with sound» of the biology course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mov
---

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# Test 5 · ★★ · Echolocation: how bats see with sound

<!-- .ven lang=en -->
At a zoo dark house, children walk with eyes shut and bump into the walls, while the bats fly freely. Why?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 4 · wrong ✗ · **Who acts:** children, bats · **What happens:** walk, bump, fly · **To what, where:** dark house, walls

<!-- .vabout -->
This is test 5 · ★★ of lesson 229 «Echolocation: how bats see with sound» of the biology 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/biology/229-echolocation-how-bats-see-with-sound/#t5).

## The question {#question}

<!-- .note -->
*Sentence 1:* At a zoo dark house, children walk with eyes shut and bump into the walls, while the bats fly freely.

```conllu
# sent_id = question:biology:229-echolocation-how-bats-see-with-sound:t5:1
# text = At a zoo dark house, children walk with eyes shut and bump into the walls, while the bats fly freely.
1	At	at	ADP	IN	_	5	case	_	_
2	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
3	zoo	zoo	NOUN	NN	Number=Sing	4	compound	_	_
4	dark	dark	ADJ	JJ	Degree=Pos	5	amod	_	_
5	house	house	NOUN	NN	Number=Sing	8	obl	_	SpaceAfter=No
6	,	,	PUNCT	,	_	5	punct	_	_
7	children	child	NOUN	NNS	Number=Plur	8	nsubj	_	_
8	walk	walk	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
9	with	with	ADP	IN	_	10	case	_	_
10	eyes	eye	NOUN	NNS	Number=Plur	8	obl	_	_
11	shut	shut	ADJ	JJ	Degree=Pos	8	xcomp	_	_
12	and	and	CCONJ	CC	_	13	cc	_	_
13	bump	bump	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	8	conj	_	_
14	into	into	ADP	IN	_	16	case	_	_
15	the	the	DET	DT	Definite=Def|PronType=Art	16	det	_	_
16	walls	wall	NOUN	NNS	Number=Plur	13	obl	_	SpaceAfter=No
17	,	,	PUNCT	,	_	21	punct	_	_
18	while	while	SCONJ	IN	_	21	mark	_	_
19	the	the	DET	DT	Definite=Def|PronType=Art	20	det	_	_
20	bats	bat	NOUN	NNS	Number=Plur	21	nsubj	_	_
21	fly	fly	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	8	conj	_	_
22	freely	freely	ADV	RB	_	21	advmod	_	SpaceAfter=No
23	.	.	PUNCT	.	_	8	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **walk** | present | children |  |  | a dark house |  | with eyes; shut *property* | vn run-51.3.2-2-1 «NP V PP.location»: agent=Theme at house=Trajectory |
| 2 | **bump** | present | children *not said here* |  |  | the walls |  |  | vn bump-18.4-1 «NP V PP.location»: agent=Theme into wall=Location |
| 3 | **fly** | present | the bats |  |  |  |  | freely *property* | vn spatial\_configuration-47.6-1 «NP V»: 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.

<!-- .note -->
*Sentence 2:* Why?

```conllu
# sent_id = question:biology:229-echolocation-how-bats-see-with-sound:t5:2
# text = Why?
1	Why	why	ADV	WRB	PronType=Int	0	root	_	SpaceAfter=No
2	?	?	PUNCT	.	_	1	punct	_	_
```

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

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
Bats can see straight through walls with special eyes

```conllu
# sent_id = question:biology:229-echolocation-how-bats-see-with-sound:t5:o1:1
# text = Bats can see straight through walls with special eyes
1	Bats	bat	NOUN	NNS	Number=Plur	3	nsubj	_	_
2	can	can	AUX	MD	VerbForm=Fin	3	aux	_	_
3	see	see	VERB	VB	VerbForm=Inf	0	root	_	_
4	straight	straight	ADV	RB	_	3	advmod	_	_
5	through	through	ADP	IN	_	6	case	_	_
6	walls	wall	NOUN	NNS	Number=Plur	3	obl	_	_
7	with	with	ADP	IN	_	9	case	_	_
8	special	special	ADJ	JJ	Degree=Pos	9	amod	_	_
9	eyes	eye	NOUN	NNS	Number=Plur	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **see** | can | Bats |  |  | walls |  | with special eyes; straight *property* | vn comprehend-87.2-1-1 «NP V»: agent=Experiencer |

### Option 2 {#o2}

<!-- .ven lang=en -->
Bats have much bigger eyes than children do

```conllu
# sent_id = question:biology:229-echolocation-how-bats-see-with-sound:t5:o2:1
# text = Bats have much bigger eyes than children do
1	Bats	bat	NOUN	NNS	Number=Plur	2	nsubj	_	_
2	have	have	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	much	much	ADV	RB	_	4	advmod	_	_
4	bigger	big	ADJ	JJR	Degree=Cmp	5	amod	_	_
5	eyes	eye	NOUN	NNS	Number=Plur	8	nsubj	_	_
6	than	than	ADP	IN	_	7	case	_	_
7	children	child	NOUN	NNS	Number=Plur	5	nmod	_	_
8	do	do	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	2	ccomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **have** | present | Bats |  |  |  |  |  | tree rules |
| 2 | **do** | present | bigger eyes than children |  |  |  |  |  | vn act-114-1 «NP V»: agent=Agent |

### Option 3 {#o3}

<!-- .ven lang=en -->
The children's ears are blocked

```conllu
# sent_id = question:biology:229-echolocation-how-bats-see-with-sound:t5:o3:1
# text = The children's ears are blocked
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	children	child	NOUN	NNS	Number=Plur	4	nmod:poss	_	SpaceAfter=No
3	's	's	PART	POS	_	2	case	_	_
4	ears	ear	NOUN	NNS	Number=Plur	6	nsubj:pass	_	_
5	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	6	aux:pass	_	_
6	blocked	block	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **block** | present · passive |  | the children's ears |  |  |  |  | vn forbid-64.4-1 «NP V NP»: subject=Theme |

### Option 4 · ✓ the right answer {#o4}

<!-- .ven lang=en -->
Bats' brains turn echoes into a picture of the world

```conllu
# sent_id = question:biology:229-echolocation-how-bats-see-with-sound:t5:o4:1
# text = Bats' brains turn echoes into a picture of the world
1	Bats	bat	NOUN	NNS	Number=Plur	3	nmod:poss	_	SpaceAfter=No
2	'	's	PART	POS	_	1	case	_	_
3	brains	brain	NOUN	NNS	Number=Plur	4	nsubj	_	_
4	turn	turn	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	echoes	echo	NOUN	NNS	Number=Plur	4	obj	_	_
6	into	into	ADP	IN	_	8	case	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
8	picture	picture	NOUN	NN	Number=Sing	4	obl	_	_
9	of	of	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	world	world	NOUN	NN	Number=Sing	8	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **turn** | present | Bats's brains | echoes |  | a picture of the world |  |  | vn roll-51.3.1 «NP V NP PP.trajectory»: agent=Agent echo=Theme into picture=Trajectory |

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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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