---
title: Identify the function of the iris in the regulation of vision. — Senses: eyes and ears · tree and pragmatics
description: Identify the function of the iris in the regulation of vision. Exam question 1 of lesson 69 «Senses: eyes and ears» 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 wrong.
---

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# Exam question 1 · Senses: eyes and ears

<!-- .ven lang=en -->
Identify the function of the iris in the regulation of vision.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **Who acts:** you · **What happens:** identify, regulate · **To what, where:** function, vision

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This is exam question 1 of lesson 69 «Senses: eyes and ears» 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/69-senses-eyes-and-ears/#e1).

## The question {#question}

```conllu
# sent_id = question:biology:69-senses-eyes-and-ears:e1:1
# text = Identify the function of the iris in the regulation of vision.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	function	function	NOUN	NN	Number=Sing	1	obj	_	_
4	of	of	ADP	IN	_	6	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	iris	iris	NOUN	NN	Number=Sing	3	nmod	_	_
7	in	in	ADP	IN	_	9	case	_	_
8	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
9	regulation	regulation	NOUN	NN	Number=Sing	6	nmod	_	_
10	of	of	ADP	IN	_	11	case	_	_
11	vision	vision	NOUN	NN	Number=Sing	9	nmod	_	SpaceAfter=No
12	.	.	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 function of the iris in the regulation of vision |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent function=Theme |
| 2 | **regulate** |  |  | vision |  |  |  |  | nom regulation «communication transitive»: of=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.

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
It produces tears

```conllu
# sent_id = question:biology:69-senses-eyes-and-ears:e1:o1:1
# text = It produces tears
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	produces	produce	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	tears	tear	NOUN	NNS	Number=Plur	2	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **produce** | present | It | tears |  |  |  |  | vn create-26.4 «NP V NP»: agent=Agent tear=Result |

### Option 2 {#o2}

<!-- .ven lang=en -->
It perceives colour

```conllu
# sent_id = question:biology:69-senses-eyes-and-ears:e1:o2:1
# text = It perceives colour
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	perceives	perceive	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	colour	colour	NOUN	NN	Number=Sing	2	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **perceive** | present | It | colour |  |  |  |  | vn see-30.1-1 «NP V S»: agent=Experiencer colour=Stimulus |

### Option 3 · ✓ the right answer {#o3}

<!-- .ven lang=en -->
It adjusts the diameter of the pupil according to the light

```conllu
# sent_id = question:biology:69-senses-eyes-and-ears:e1:o3:1
# text = It adjusts the diameter of the pupil according to the light
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	adjusts	adjust	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	diameter	diameter	NOUN	NN	Number=Sing	2	obj	_	_
5	of	of	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	pupil	pupil	NOUN	NN	Number=Sing	4	nmod	_	_
8	according	accord	VERB	VBG	ExtPos=ADP|Tense=Pres|VerbForm=Part	11	case	_	_
9	to	to	ADP	IN	_	8	fixed	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	light	light	NOUN	NN	Number=Sing	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **adjust** | present | It | the diameter of the pupil |  |  |  | accord the light | vn adjust-26.9 «NP V NP»: agent=Agent diameter=Patient |
| 2 | **accord** | gerund |  |  |  |  |  |  | vn future\_having-13.3 «NP V NP.theme (PP)»: agent=Agent |

### Option 4 {#o4}

<!-- .ven lang=en -->
It forms the inverted image upon the retina at the rear of the eye

```conllu
# sent_id = question:biology:69-senses-eyes-and-ears:e1:o4:1
# text = It forms the inverted image upon the retina at the rear of the eye
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	forms	form	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	inverted	invert	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	5	amod	_	_
5	image	image	NOUN	NN	Number=Sing	2	obj	_	_
6	upon	upon	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	retina	retina	NOUN	NN	Number=Sing	2	obl	_	_
9	at	at	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	rear	rear	NOUN	NN	Number=Sing	8	nmod	_	_
12	of	of	ADP	IN	_	14	case	_	_
13	the	the	DET	DT	Definite=Def|PronType=Art	14	det	_	_
14	eye	eye	NOUN	NN	Number=Sing	11	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **form** | present | It | the inverted image |  |  |  | upon the retina at the rear of the eye | vn appear-48.1.1 «PP.location V NP»: agent=Location image=Theme |
| 2 | **invert** | participle |  |  |  |  |  |  | vn remedy-45.7 «NP V NP.patient»: agent=Agent |

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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.

<!-- /div -->

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