---
title: Identify the principal nature of the tusk of the narwhal. — More record-breakers and oddballs: slo… · tree and pragmatics
description: Identify the principal nature of the tusk of the narwhal. Exam question 2 of lesson 45 «More record-breakers and oddballs: sloth, narwhal, chameleon, electric eel, giraffe» 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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# Exam question 2 · More record-breakers and oddballs: sloth, narwhal, chamele…

<!-- .ven lang=en -->
Identify the principal nature of the tusk of the narwhal.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 4 · wrong ✗ · **Who acts:** you · **What happens:** identify · **To what, where:** principal nature

<!-- .vabout -->
This is exam question 2 of lesson 45 «More record-breakers and oddballs: sloth, narwhal, chameleon, electric eel, giraffe» 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/45-sloth-narwhal-chameleon-eel-giraffe/#e2).

## The question {#question}

```conllu
# sent_id = question:biology:45-sloth-narwhal-chameleon-eel-giraffe:e2:1
# text = Identify the principal nature of the tusk of the narwhal.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
3	principal	principal	ADJ	JJ	Degree=Pos	4	amod	_	_
4	nature	nature	NOUN	NN	Number=Sing	1	obj	_	_
5	of	of	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	tusk	tusk	NOUN	NN	Number=Sing	4	nmod	_	_
8	of	of	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	narwhal	narwhal	NOUN	NN	Number=Sing	7	nmod	_	SpaceAfter=No
11	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* | the principal nature of the tusk of the narwhal |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent nature=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 -->
It is a horn arising from the centre of the forehead

```conllu
# sent_id = question:biology:45-sloth-narwhal-chameleon-eel-giraffe:e2:o1:1
# text = It is a horn arising from the centre of the forehead
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
4	horn	horn	NOUN	NN	Number=Sing	0	root	_	_
5	arising	arise	VERB	VBG	VerbForm=Ger	4	acl	_	_
6	from	from	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	centre	centre	NOUN	NN	Number=Sing	5	obl	_	_
9	of	of	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	forehead	forehead	NOUN	NN	Number=Sing	8	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | It | a horn |  |  |  |  | tree rules |
| 2 | **arise** | gerund | a horn *not said here* |  |  | the centre of the forehead |  |  | vn appear-48.1.1 «NP V»: agent=Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
It is a modified fin of hardened skin

```conllu
# sent_id = question:biology:45-sloth-narwhal-chameleon-eel-giraffe:e2:o2:1
# text = It is a modified fin of hardened skin
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	5	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	modified	modify	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	5	amod	_	_
5	fin	fin	NOUN	NN	Number=Sing	0	root	_	_
6	of	of	ADP	IN	_	8	case	_	_
7	hardened	harden	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	8	amod	_	_
8	skin	skin	NOUN	NN	Number=Sing	5	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **modify** | participle |  |  |  |  |  |  | vn other\_cos-45.4 «NP.patient V»: agent=Patient |
| 2 | **is a** | present | It | a modified fin |  |  |  | of hardened skin | tree rules |
| 3 | **harden** | participle |  |  |  |  |  |  | vn other\_cos-45.4 «NP.patient V»: agent=Patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
It is a bone of the nose extended forward

```conllu
# sent_id = question:biology:45-sloth-narwhal-chameleon-eel-giraffe:e2:o3:1
# text = It is a bone of the nose extended forward
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
4	bone	bone	NOUN	NN	Number=Sing	0	root	_	_
5	of	of	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	nose	nose	NOUN	NN	Number=Sing	4	nmod	_	_
8	extended	extend	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	acl	_	_
9	forward	forward	ADV	RB	_	8	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | It | a bone |  |  |  | of the nose | tree rules |
| 2 | **extend** | participle |  | a bone *not said here* |  |  |  | forward *property* | vn exist-47.1 «NP V»: agent=Theme |

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

<!-- .ven lang=en -->
It is a tooth, usually the left upper canine, protruding in a spiral through the lip

<!-- fold The tree, 16 words -->
```conllu
# sent_id = question:biology:45-sloth-narwhal-chameleon-eel-giraffe:e2:o4:1
# text = It is a tooth, usually the left upper canine, protruding in a spiral through the lip
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
4	tooth	tooth	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
5	,	,	PUNCT	,	_	10	punct	_	_
6	usually	usually	ADV	RB	_	10	advmod	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
8	left	left	ADJ	JJ	Degree=Pos	10	amod	_	_
9	upper	upper	ADJ	JJ	Degree=Pos	10	amod	_	_
10	canine	canine	NOUN	NN	Number=Sing	4	appos	_	SpaceAfter=No
11	,	,	PUNCT	,	_	12	punct	_	_
12	protruding	protrude	VERB	VBG	VerbForm=Ger	10	acl	_	_
13	in	in	ADP	IN	_	15	case	_	_
14	a	a	DET	DT	Definite=Ind|PronType=Art	15	det	_	_
15	spiral	spiral	NOUN	NN	Number=Sing	12	obl	_	_
16	through	through	ADP	IN	_	18	case	_	_
17	the	the	DET	DT	Definite=Def|PronType=Art	18	det	_	_
18	lip	lip	NOUN	NN	Number=Sing	12	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | It | a tooth |  |  |  |  | tree rules |
| 2 | **protrude** | gerund | the left upper canine *not said here* |  |  | a spiral |  | through the lip | vn spatial\_configuration-47.6 «NP V PP.location»: agent=Theme in spiral=Location |

<!-- 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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- ↑ back to [More record-breakers and oddballs: sloth, narwhal, chameleon, electric eel, giraffe](https://md.mova.elamur.ai/free/en/corpora/questions/biology/45-sloth-narwhal-chameleon-eel-giraffe/)