---
title: Identify the principal function of yeast in the leavening of bread. — Fungi: mushrooms, mould and yeast · tree and pragmatics
description: Identify the principal function of yeast in the leavening of bread. Exam question 2 of lesson 62 «Fungi: mushrooms, mould and yeast» 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 2 · Fungi: mushrooms, mould and yeast

<!-- .ven lang=en -->
Identify the principal function of yeast in the leavening of bread.

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

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This is exam question 2 of lesson 62 «Fungi: mushrooms, mould and yeast» 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/62-fungi-mushrooms-mould-and-yeast/#e2).

## The question {#question}

```conllu
# sent_id = question:biology:62-fungi-mushrooms-mould-and-yeast:e2:1
# text = Identify the principal function of yeast in the leavening of bread.
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	function	function	NOUN	NN	Number=Sing	1	obj	_	_
5	of	of	ADP	IN	_	6	case	_	_
6	yeast	yeast	NOUN	NN	Number=Sing	4	nmod	_	_
7	in	in	ADP	IN	_	9	case	_	_
8	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
9	leavening	leavening	NOUN	NN	Number=Sing	6	nmod	_	_
10	of	of	ADP	IN	_	11	case	_	_
11	bread	bread	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 principal function of yeast in the leavening of bread |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent function=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 -->
The neutralisation of salt

```conllu
# sent_id = question:biology:62-fungi-mushrooms-mould-and-yeast:e2:o1:1
# text = The neutralisation of salt
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	neutralisation	neutralisation	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	salt	salt	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **neutralise** |  |  | salt |  |  |  |  | nom neutralisation «process transitive»: of=patient |

### Option 2 {#o2}

<!-- .ven lang=en -->
The absorption of water by flour

```conllu
# sent_id = question:biology:62-fungi-mushrooms-mould-and-yeast:e2:o2:1
# text = The absorption of water by flour
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	absorption	absorption	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	water	water	NOUN	NN	Number=Sing	2	nmod	_	_
5	by	by	ADP	IN	_	6	case	_	_
6	flour	flour	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **absorb** |  | flour | water |  |  |  |  | nom absorption «process transitive»: of=patient by=agent |

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

<!-- .ven lang=en -->
The production of carbon dioxide gas from sugar

```conllu
# sent_id = question:biology:62-fungi-mushrooms-mould-and-yeast:e2:o3:1
# text = The production of carbon dioxide gas from sugar
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	production	production	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	6	case	_	_
4	carbon	carbon	NOUN	NN	Number=Sing	5	compound	_	_
5	dioxide	dioxide	NOUN	NN	Number=Sing	6	compound	_	_
6	gas	gas	NOUN	NN	Number=Sing	2	nmod	_	_
7	from	from	ADP	IN	_	8	case	_	_
8	sugar	sugar	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **produce** |  |  | dioxide gas |  | sugar |  |  | nom production «act transitive»: of=patient from=place |

### Option 4 {#o4}

<!-- .ven lang=en -->
The hardening of the crust in the oven

```conllu
# sent_id = question:biology:62-fungi-mushrooms-mould-and-yeast:e2:o4:1
# text = The hardening of the crust in the oven
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	hardening	hardening	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	crust	crust	NOUN	NN	Number=Sing	2	nmod	_	_
6	in	in	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	oven	oven	NOUN	NN	Number=Sing	5	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **harden** |  | the crust in the oven |  |  |  |  |  | nom hardening «state intransitive»: of=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.

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