---
title: If bacteria double every 20 minutes, how many does 1 bacterium becom… — Thinking it through: the science behin… · tree and pragmatics
description: If bacteria double every 20 minutes, how many does 1 bacterium become after 2 hours? Test 3 · ★★★ of lesson 40 «Thinking it through: the science behind home safety» of the everyday course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's cho
---

<!-- md -->
[Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/questions/everyday/40-home-safety-reasoning/t3/)

<!-- crumbs -->
[home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [questions](https://md.mova.elamur.ai/free/en/corpora/questions/) / [Everyday](https://md.mova.elamur.ai/free/en/corpora/questions/everyday/) / [Thinking it through: the science behin…](https://md.mova.elamur.ai/free/en/corpora/questions/everyday/40-home-safety-reasoning/) / t3

# Test 3 · ★★★ · Thinking it through: the science behind home safety

<!-- .ven lang=en -->
If bacteria double every 20 minutes, how many does 1 bacterium become after 2 hours?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **Who acts:** bacteria, many · **What happens:** double, do, become · **To what, where:** 1 bacterium

<!-- .vabout -->
This is test 3 · ★★★ of lesson 40 «Thinking it through: the science behind home safety» of the everyday course of Mova's primary school. 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/everyday/40-home-safety-reasoning/#t3).

## The question {#question}

```conllu
# sent_id = question:everyday:40-home-safety-reasoning:t3:1
# text = If bacteria double every 20 minutes, how many does 1 bacterium become after 2 hours?
1	If	if	SCONJ	IN	_	3	mark	_	_
2	bacteria	bacterium	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	double	double	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	10	advcl	_	_
4	every	every	DET	DT	PronType=Tot	6	det	_	_
5	20	20	NUM	CD	NumForm=Digit|NumType=Card	6	nummod	_	_
6	minutes	minute	NOUN	NNS	Number=Plur	3	obj	_	SpaceAfter=No
7	,	,	PUNCT	,	_	3	punct	_	_
8	how	how	ADV	WRB	PronType=Int	9	advmod	_	_
9	many	many	ADJ	JJ	Degree=Pos	10	nsubj	_	_
10	does	do	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
11	1	1	NUM	CD	NumForm=Digit|NumType=Card	12	nummod	_	_
12	bacterium	bacterium	NOUN	NN	Number=Sing	10	obj	_	_
13	become	become	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	12	acl	_	_
14	after	after	ADP	IN	_	16	case	_	_
15	2	2	NUM	CD	NumForm=Digit|NumType=Card	16	nummod	_	_
16	hours	hour	NOUN	NNS	Number=Plur	13	obl	_	SpaceAfter=No
17	?	?	PUNCT	.	_	10	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **double** *a condition, not said to happen* | present | bacteria |  |  |  | minute |  | vn other\_cos-45.4 «NP.patient V»: agent=Patient |
| 2 | **do** | present | many | 1 bacterium |  |  |  |  | vn act-114-1 «NP V NP»: agent=Agent bacterium=Eventuality |
| 3 | **become** | participle |  | 1 bacterium *not said here* |  |  | hour |  | vn become-109.1-1-1 «NP V PP.attribute»: agent=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 -->
32

```conllu
# sent_id = question:everyday:40-home-safety-reasoning:t3:o1:1
# text = 32
1	32	32	NUM	CD	NumForm=Digit|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 2 {#o2}

<!-- .ven lang=en -->
12

```conllu
# sent_id = question:everyday:40-home-safety-reasoning:t3:o2:1
# text = 12
1	12	12	NUM	CD	NumForm=Digit|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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

<!-- .ven lang=en -->
64

```conllu
# sent_id = question:everyday:40-home-safety-reasoning:t3:o3:1
# text = 64
1	64	64	NUM	CD	NumForm=Digit|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 {#o4}

<!-- .ven lang=en -->
6

```conllu
# sent_id = question:everyday:40-home-safety-reasoning:t3:o4:1
# text = 6
1	6	6	NUM	CD	NumForm=Digit|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

<!-- 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 -->

<!-- pn -->
- ← previous: [Thinking it through: the science behin…, test 2](https://md.mova.elamur.ai/free/en/corpora/questions/everyday/40-home-safety-reasoning/t2/)
- next →: [Thinking it through: the science behin…, test 4](https://md.mova.elamur.ai/free/en/corpora/questions/everyday/40-home-safety-reasoning/t4/)
- ↑ back to [Thinking it through: the science behind home safety](https://md.mova.elamur.ai/free/en/corpora/questions/everyday/40-home-safety-reasoning/)