---
title: Identify the principal reason for which octopus blood is blue in col… — The aquarium: jellyfish, octopuses, se… · tree and pragmatics
description: Identify the principal reason for which octopus blood is blue in colour. Exam question 3 of lesson 92 «The aquarium: jellyfish, octopuses, sea stars and the deep sea» of the biology course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's ch
---

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# Exam question 3 · The aquarium: jellyfish, octopuses, sea stars and the deep…

<!-- .ven lang=en -->
Identify the principal reason for which octopus blood is blue in colour.

<!-- .vintro -->
**Mova's choice:** option 4 · **The right answer:** option 4 · right ✓ · **Who acts:** you, octopus blood · **What happens:** identify, be · **To what, where:** principal reason, colour

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This is exam question 3 of lesson 92 «The aquarium: jellyfish, octopuses, sea stars and the deep sea» 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/92-the-aquarium-jellyfish-octopuses-sea-stars-and-the-deep-sea/#e3).

## The question {#question}

```conllu
# sent_id = question:biology:92-the-aquarium-jellyfish-octopuses-sea-stars-and-the-deep-sea:e3:1
# text = Identify the principal reason for which octopus blood is blue in colour.
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	reason	reason	NOUN	NN	Number=Sing	1	obj	_	_
5	for	for	ADP	IN	_	6	case	_	_
6	which	which	PRON	WDT	PronType=Rel	10	obl	_	_
7	octopus	octopus	NOUN	NN	Number=Sing	8	compound	_	_
8	blood	blood	NOUN	NN	Number=Sing	10	nsubj	_	_
9	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	10	cop	_	_
10	blue	blue	ADJ	JJ	Degree=Pos	4	acl	_	_
11	in	in	ADP	IN	_	12	case	_	_
12	colour	colour	NOUN	NN	Number=Sing	10	obl	_	SpaceAfter=No
13	.	.	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 reason |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent reason=Theme |
| 2 | **is** | present | octopus blood |  |  | colour |  | for the principal reason; blue *property* | tree rules |

<!-- .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 {#o1}

<!-- .ven lang=en -->
Its body temperature is exceedingly low

```conllu
# sent_id = question:biology:92-the-aquarium-jellyfish-octopuses-sea-stars-and-the-deep-sea:e3:o1:1
# text = Its body temperature is exceedingly low
1	Its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	3	nmod:poss	_	_
2	body	body	NOUN	NN	Number=Sing	3	compound	_	_
3	temperature	temperature	NOUN	NN	Number=Sing	6	nsubj	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
5	exceedingly	exceedingly	ADV	RB	_	6	advmod	_	_
6	low	low	ADJ	JJ	Degree=Pos	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | Its body temperature |  |  |  |  | exceedingly, low *property* | tree rules |

### Option 2 {#o2}

<!-- .ven lang=en -->
Its ink is dissolved within the blood

```conllu
# sent_id = question:biology:92-the-aquarium-jellyfish-octopuses-sea-stars-and-the-deep-sea:e3:o2:1
# text = Its ink is dissolved within the blood
1	Its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	2	nmod:poss	_	_
2	ink	ink	NOUN	NN	Number=Sing	4	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	dissolved	dissolve	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	within	within	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	blood	blood	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **dissolve** | present · passive |  | Its ink |  |  |  | within the blood | vn break-45.1 «NP V NP»: subject=Patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
The animal ingests large quantities of seawater, which tints the blood

```conllu
# sent_id = question:biology:92-the-aquarium-jellyfish-octopuses-sea-stars-and-the-deep-sea:e3:o3:1
# text = The animal ingests large quantities of seawater, which tints the blood
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	animal	animal	NOUN	NN	Number=Sing	3	nsubj	_	_
3	ingests	ingest	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	large	large	ADJ	JJ	Degree=Pos	5	amod	_	_
5	quantities	quantity	NOUN	NNS	Number=Plur	3	obj	_	_
6	of	of	ADP	IN	_	7	case	_	_
7	seawater	seawater	NOUN	NN	Number=Sing	5	nmod	_	SpaceAfter=No
8	,	,	PUNCT	,	_	10	punct	_	_
9	which	which	PRON	WDT	PronType=Rel	10	nsubj	_	_
10	tints	tint	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	acl:relcl	_	_
11	the	the	DET	DT	Definite=Def|PronType=Art	12	det	_	_
12	blood	blood	NOUN	NN	Number=Sing	10	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **ingest** | present | the animal | large quantities of seawater |  |  |  |  | vn absorb-39.8 «NP V NP»: agent=Goal quantity=Theme |
| 2 | **tint** | present | seawater | the blood |  |  |  |  | vn coloring-24 «NP V NP»: agent=Agent blood=Patient |

### Option 4 · ← Mova's choice · ✓ the right answer {#o4}

<!-- .ven lang=en -->
Oxygen is carried by a substance containing copper rather than iron

```conllu
# sent_id = question:biology:92-the-aquarium-jellyfish-octopuses-sea-stars-and-the-deep-sea:e3:o4:1
# text = Oxygen is carried by a substance containing copper rather than iron
1	Oxygen	oxygen	NOUN	NN	Number=Sing	3	nsubj:pass	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	carried	carry	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	by	by	ADP	IN	_	6	case	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	substance	substance	NOUN	NN	Number=Sing	3	obl	_	_
7	containing	contain	VERB	VBG	VerbForm=Ger	8	amod	_	_
8	copper	copper	NOUN	NN	Number=Sing	6	conj	_	_
9	rather	rather	ADV	RB	ExtPos=CCONJ	11	cc	_	_
10	than	than	ADP	IN	_	9	fixed	_	_
11	iron	iron	NOUN	NN	Number=Sing	6	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **carry** | present · passive | a substance and containing copper rather iron | Oxygen |  |  |  |  | vn carry-11.4 «NP V NP»: agent=Agent subject=Theme |
| 2 | **contain** | gerund |  |  |  |  |  |  | vn comprise-107.2-2 «NP V NP»: agent=Pivot |

<!-- 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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