---
title: Which of the following statements most accurately characterises univ… — Indicators: the red-cabbage rainbow · tree and pragmatics
description: Which of the following statements most accurately characterises universal indicator? Exam question 3 of lesson 17 «Indicators: the red-cabbage rainbow» of the chemistry course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wron
---

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# Exam question 3 · Indicators: the red-cabbage rainbow

<!-- .ven lang=en -->
Which of the following statements most accurately characterises universal indicator?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **What happens:** follow, characteris · **To what, where:** universal indicator

<!-- .vabout -->
This is exam question 3 of lesson 17 «Indicators: the red-cabbage rainbow» of the chemistry 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/chemistry/17-indicators-the-red-cabbage-rainbow/#e3).

## The question {#question}

```conllu
# sent_id = question:chemistry:17-indicators-the-red-cabbage-rainbow:e3:1
# text = Which of the following statements most accurately characterises universal indicator?
1	Which	which	PRON	WDT	PronType=Rel	8	nsubj	_	_
2	of	of	ADP	IN	_	5	case	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	following	follow	VERB	VBG	VerbForm=Ger	5	amod	_	_
5	statements	statement	NOUN	NNS	Number=Plur	8	obl	_	_
6	most	most	ADV	RBS	Degree=Sup	7	advmod	_	_
7	accurately	accurately	ADV	RB	_	8	advmod	_	_
8	characterises	characteris	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
9	universal	universal	ADJ	JJ	Degree=Pos	10	amod	_	_
10	indicator	indicator	NOUN	NN	Number=Sing	8	obj	_	SpaceAfter=No
11	?	?	PUNCT	.	_	8	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **follow** | gerund |  |  |  |  |  |  | vn occur-48.3-1 «NP V»: agent=Theme |
| 2 | **characteris** | present |  | universal indicator |  |  |  | of the following statements; accurately *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 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
It is a single dye derived exclusively from red cabbage

```conllu
# sent_id = question:chemistry:17-indicators-the-red-cabbage-rainbow:e3:o1:1
# text = It is a single dye derived exclusively from red cabbage
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	6	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	single	single	ADJ	JJ	Degree=Pos	5	amod	_	_
5	dye	dye	NOUN	NN	Number=Sing	6	nsubj	_	_
6	derived	derive	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	0	root	_	_
7	exclusively	exclusively	ADV	RB	_	6	advmod	_	_
8	from	from	ADP	IN	_	10	case	_	_
9	red	red	ADJ	JJ	Degree=Pos	10	amod	_	_
10	cabbage	cabbage	NOUN	NN	Number=Sing	6	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | It |  |  | red cabbage |  | derive, exclusively *property* | tree rules |

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
It is a mixture of indicators producing a distinct colour for each pH

```conllu
# sent_id = question:chemistry:17-indicators-the-red-cabbage-rainbow:e3:o2:1
# text = It is a mixture of indicators producing a distinct colour for each pH
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	mixture	mixture	NOUN	NN	Number=Sing	0	root	_	_
5	of	of	ADP	IN	_	6	case	_	_
6	indicators	indicator	NOUN	NNS	Number=Plur	4	nmod	_	_
7	producing	produce	VERB	VBG	VerbForm=Ger	6	acl	_	_
8	a	a	DET	DT	Definite=Ind|PronType=Art	10	det	_	_
9	distinct	distinct	ADJ	JJ	Degree=Pos	10	amod	_	_
10	colour	colour	NOUN	NN	Number=Sing	7	obj	_	_
11	for	for	ADP	IN	_	13	case	_	_
12	each	each	DET	DT	PronType=Tot	13	det	_	_
13	pH	ph	NOUN	NN	Number=Sing	7	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | It | a mixture |  |  |  | of indicators | tree rules |
| 2 | **produce** | gerund | indicators *not said here* | a distinct colour |  |  |  | for each pH | vn create-26.4 «NP V NP PP.beneficiary»: agent=Agent colour=Result for ph=Beneficiary |

### Option 3 {#o3}

<!-- .ven lang=en -->
It is a device that measures pH by electricity

```conllu
# sent_id = question:chemistry:17-indicators-the-red-cabbage-rainbow:e3:o3:1
# text = It is a device that measures pH by electricity
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	device	device	NOUN	NN	Number=Sing	0	root	_	_
5	that	that	PRON	WDT	PronType=Rel	6	nsubj	_	_
6	measures	measure	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	acl:relcl	_	_
7	pH	ph	NOUN	NN	Number=Sing	6	obj	_	_
8	by	by	ADP	IN	_	9	case	_	_
9	electricity	electricity	NOUN	NN	Number=Sing	6	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | It | a device |  |  |  |  | tree rules |
| 2 | **measure** | present | a device | pH |  |  |  | by electricity | vn register-54.1-2-1 «NP V NP.value»: agent=Theme ph=Value |

### Option 4 {#o4}

<!-- .ven lang=en -->
It changes colour only in the presence of strong acids

```conllu
# sent_id = question:chemistry:17-indicators-the-red-cabbage-rainbow:e3:o4:1
# text = It changes colour only in the presence of strong acids
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	changes	change	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	colour	colour	NOUN	NN	Number=Sing	2	obj	_	_
4	only	only	ADV	RB	_	7	advmod	_	_
5	in	in	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	presence	presence	NOUN	NN	Number=Sing	2	obl	_	_
8	of	of	ADP	IN	_	10	case	_	_
9	strong	strong	ADJ	JJ	Degree=Pos	10	amod	_	_
10	acids	acid	NOUN	NNS	Number=Plur	7	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **change** | present | It | colour |  | the presence of strong acids |  |  | vn dress-41.1.1-1-1 «NP V NP»: agent=Agent colour=Patient |

<!-- 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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