---
title: A ray in the touch pool has no barb on its tail. Why? — The aquarium: the shark tunnel and the… · tree and pragmatics
description: A ray in the touch pool has no barb on its tail. Why? Test 6 of lesson 91 «The aquarium: the shark tunnel and the rays» 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 right.
---

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# Test 6 · The aquarium: the shark tunnel and the rays

<!-- .ven lang=en -->
A ray in the touch pool has no barb on its tail. Why?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** ray · **What happens:** have · **To what, where:** barb, tail

<!-- .vabout -->
This is test 6 of lesson 91 «The aquarium: the shark tunnel and the rays» 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/91-the-aquarium-the-shark-tunnel-and-the-rays/#t6).

## The question {#question}

<!-- .note -->
*Sentence 1:* A ray in the touch pool has no barb on its tail.

```conllu
# sent_id = question:biology:91-the-aquarium-the-shark-tunnel-and-the-rays:t6:1
# text = A ray in the touch pool has no barb on its tail.
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	ray	ray	NOUN	NN	Number=Sing	7	nsubj	_	_
3	in	in	ADP	IN	_	6	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
5	touch	touch	NOUN	NN	Number=Sing	6	compound	_	_
6	pool	pool	NOUN	NN	Number=Sing	2	nmod	_	_
7	has	have	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
8	no	no	DET	DT	PronType=Neg	9	det	_	_
9	barb	barb	NOUN	NN	Number=Sing	7	obj	_	_
10	on	on	ADP	IN	_	12	case	_	_
11	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	12	nmod:poss	_	_
12	tail	tail	NOUN	NN	Number=Sing	9	nmod	_	SpaceAfter=No
13	.	.	PUNCT	.	_	7	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **have** | present | a ray in the touch pool | no barb |  | ray's tail |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent barb=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:* Why?

```conllu
# sent_id = question:biology:91-the-aquarium-the-shark-tunnel-and-the-rays:t6:2
# 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 · ✓ the right answer {#o1}

<!-- .ven lang=en -->
Keepers trimmed it safely so visitors cannot be stung

```conllu
# sent_id = question:biology:91-the-aquarium-the-shark-tunnel-and-the-rays:t6:o1:1
# text = Keepers trimmed it safely so visitors cannot be stung
1	Keepers	keeper	NOUN	NNS	Number=Plur	2	nsubj	_	_
2	trimmed	trim	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	0	root	_	_
3	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	obj	_	_
4	safely	safely	ADV	RB	_	2	advmod	_	_
5	so	so	SCONJ	IN	_	10	mark	_	_
6	visitors	visitor	NOUN	NNS	Number=Plur	10	nsubj:pass	_	_
7	can	can	AUX	MD	VerbForm=Fin	10	aux	_	SpaceAfter=No
8	not	not	PART	RB	Polarity=Neg	10	advmod	_	_
9	be	be	AUX	VB	VerbForm=Inf	10	aux:pass	_	_
10	stung	sting	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	2	advcl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **trim** | past | Keepers | it |  |  |  | safely *property* | vn braid-41.2.2 «NP V NP»: agent=Agent it=Patient |
| 2 | **not** **sting** | can · passive |  | visitors |  |  |  |  | vn amuse-31.1 «NP V NP»: subject=Experiencer |

### Option 2 {#o2}

<!-- .ven lang=en -->
Rays are born without barbs

```conllu
# sent_id = question:biology:91-the-aquarium-the-shark-tunnel-and-the-rays:t6:o2:1
# text = Rays are born without barbs
1	Rays	ray	NOUN	NNS	Number=Plur	3	nsubj:pass	_	_
2	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	born	bear	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	without	without	ADP	IN	_	5	case	_	_
5	barbs	barb	NOUN	NNS	Number=Plur	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **bear** | present · passive |  | Rays |  |  |  | without barbs | vn birth-28.2-1-1 «NP V NP»: subject=Patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
It used the barb to spear fish and snapped it off on a rock

```conllu
# sent_id = question:biology:91-the-aquarium-the-shark-tunnel-and-the-rays:t6:o3:1
# text = It used the barb to spear fish and snapped it off on a rock
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	used	use	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	barb	barb	NOUN	NN	Number=Sing	2	obj	_	_
5	to	to	PART	TO	_	7	mark	_	_
6	spear	spear	NOUN	NN	Number=Sing	7	compound	_	_
7	fish	fish	NOUN	NN	Number=Sing	2	advcl	_	_
8	and	and	CCONJ	CC	_	9	cc	_	_
9	snapped	snap	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	2	conj	_	_
10	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	9	obj	_	_
11	off	off	ADP	RP	_	9	compound:prt	_	_
12	on	on	ADP	IN	_	14	case	_	_
13	a	a	DET	DT	Definite=Ind|PronType=Art	14	det	_	_
14	rock	rock	NOUN	NN	Number=Sing	9	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **use** | past | It | the barb |  |  |  |  | vn eat-39.1 «NP V NP»: agent=Agent barb=Patient |
| 2 | **snap off** | past |  | barb |  | a rock |  |  | vn sound\_emission-43.2 «PP.location V NP»: agent=Location it=Theme |

### Option 4 {#o4}

<!-- .ven lang=en -->
The barb only grows in the wild ocean

```conllu
# sent_id = question:biology:91-the-aquarium-the-shark-tunnel-and-the-rays:t6:o4:1
# text = The barb only grows in the wild ocean
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	barb	barb	NOUN	NN	Number=Sing	4	nsubj	_	_
3	only	only	ADV	RB	_	4	advmod	_	_
4	grows	grow	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	in	in	ADP	IN	_	8	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
7	wild	wild	ADJ	JJ	Degree=Pos	8	amod	_	_
8	ocean	ocean	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **grow** | present | the barb |  |  | the wild ocean |  |  | vn appear-48.1.1 «NP V PP.location»: agent=Theme in ocean=Location |

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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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