---
title: Identify the principal reason for which a Venus flytrap requires two… — Plants deeper: carnivorous plants that… · tree and pragmatics
description: Identify the principal reason for which a Venus flytrap requires two stimuli of its trigger hairs prior to closure. Exam question 1 of lesson 254 «Plants deeper: carnivorous plants that count, slip and suck» of the biology course of Mova's primary school, with the dependency tree and pragmatics of t
---

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# Exam question 1 · Plants deeper: carnivorous plants that count, slip and suck

<!-- .ven lang=en -->
Identify the principal reason for which a Venus flytrap requires two stimuli of its trigger hairs prior to closure.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 4 · wrong ✗ · **Who acts:** you, Venus flytrap · **What happens:** identify, require · **To what, where:** principal reason, two stimuli

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This is exam question 1 of lesson 254 «Plants deeper: carnivorous plants that count, slip and suck» 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/254-plants-deeper-carnivorous-plants-that-count-slip-and-suck/#e1).

## The question {#question}

```conllu
# sent_id = question:biology:254-plants-deeper-carnivorous-plants-that-count-slip-and-suck:e1:1
# text = Identify the principal reason for which a Venus flytrap requires two stimuli of its trigger hairs prior to closure.
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	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	_	_
8	Venus	Venus	PROPN	NNP	Number=Sing	9	compound	_	_
9	flytrap	flytrap	NOUN	NN	Number=Sing	10	nsubj	_	_
10	requires	require	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	acl	_	_
11	two	two	NUM	CD	NumForm=Word|NumType=Card	12	nummod	_	_
12	stimuli	stimulus	NOUN	NNS	Number=Plur	10	obj	_	_
13	of	of	ADP	IN	_	16	case	_	_
14	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	16	nmod:poss	_	_
15	trigger	trigger	NOUN	NN	Number=Sing	16	compound	_	_
16	hairs	hair	NOUN	NNS	Number=Plur	12	nmod	_	_
17	prior	prior	ADJ	JJ	Degree=Pos|ExtPos=ADP	19	case	_	_
18	to	to	ADP	IN	_	17	fixed	_	_
19	closure	closure	NOUN	NN	Number=Sing	16	nmod	_	SpaceAfter=No
20	.	.	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 | **require** | present | a Venus flytrap | two stimuli of flytrap's trigger hairs prior closure |  |  |  | for the principal reason | vn require-103-1 «NP V NP»: agent=Theme stimulus=Precondition |

<!-- .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 necessity of warming the trap by sunlight before any movement is possible

```conllu
# sent_id = question:biology:254-plants-deeper-carnivorous-plants-that-count-slip-and-suck:e1:o1:1
# text = The necessity of warming the trap by sunlight before any movement is possible
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	necessity	necessity	NOUN	NN	Number=Sing	13	nsubj	_	_
3	of	of	SCONJ	IN	_	4	mark	_	_
4	warming	warm	VERB	VBG	VerbForm=Ger	2	acl	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	trap	trap	NOUN	NN	Number=Sing	4	obj	_	_
7	by	by	ADP	IN	_	8	case	_	_
8	sunlight	sunlight	NOUN	NN	Number=Sing	4	obl	_	_
9	before	before	ADP	IN	_	11	case	_	_
10	any	any	DET	DT	PronType=Ind	11	det	_	_
11	movement	movement	NOUN	NN	Number=Sing	4	obl	_	_
12	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	13	cop	_	_
13	possible	possible	ADJ	JJ	Degree=Pos	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **warm** | gerund | the necessity *not said here* | the trap |  |  | before any movement | by sunlight | vn other\_cos-45.4 «NP V NP.patient»: agent=Agent trap=Patient |
| 2 | **is** | present | the necessity |  |  |  |  | possible *property* | tree rules |

### Option 2 {#o2}

<!-- .ven lang=en -->
The provision of time for the prey to escape

```conllu
# sent_id = question:biology:254-plants-deeper-carnivorous-plants-that-count-slip-and-suck:e1:o2:1
# text = The provision of time for the prey to escape
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	provision	provision	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	time	time	NOUN	NN	Number=Sing	2	nmod	_	_
5	for	for	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	prey	prey	NOUN	NN	Number=Sing	2	nmod	_	_
8	to	to	PART	TO	_	9	mark	_	_
9	escape	escape	VERB	VB	VerbForm=Inf	2	acl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **escape** | to-infinitive |  |  |  |  |  |  | vn escape-51.1-1-1 «NP V»: agent=Theme |
| 2 | **provide** |  | time |  |  |  |  | for the prey | nom provision «communication intransitive»: of=agent for=obl |

### Option 3 {#o3}

<!-- .ven lang=en -->
The requirement to attract a second insect

```conllu
# sent_id = question:biology:254-plants-deeper-carnivorous-plants-that-count-slip-and-suck:e1:o3:1
# text = The requirement to attract a second insect
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	requirement	requirement	NOUN	NN	Number=Sing	0	root	_	_
3	to	to	PART	TO	_	4	mark	_	_
4	attract	attract	VERB	VB	VerbForm=Inf	2	acl	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
6	second	second	ADJ	JJ	Degree=Pos|NumForm=Word|NumType=Ord	7	amod	_	_
7	insect	insect	NOUN	NN	Number=Sing	4	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **attract** | to-infinitive |  | a second insect |  |  |  |  | vn lure-59.3 «NP V NP»: agent=Agent insect=Patient |

### Option 4 · ✓ the right answer {#o4}

<!-- .ven lang=en -->
The avoidance of wasteful closure upon raindrops and other non-living objects

```conllu
# sent_id = question:biology:254-plants-deeper-carnivorous-plants-that-count-slip-and-suck:e1:o4:1
# text = The avoidance of wasteful closure upon raindrops and other non-living objects
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	avoidance	avoidance	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	wasteful	wasteful	ADJ	JJ	Degree=Pos	5	amod	_	_
5	closure	closure	NOUN	NN	Number=Sing	2	nmod	_	_
6	upon	upon	ADP	IN	_	7	case	_	_
7	raindrops	raindrop	NOUN	NNS	Number=Plur	5	nmod	_	_
8	and	and	CCONJ	CC	_	11	cc	_	_
9	other	other	ADJ	JJ	Degree=Pos	11	amod	_	_
10	non-living	non-living	NOUN	NN	Number=Sing	11	compound	_	_
11	objects	object	NOUN	NNS	Number=Plur	7	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **avoid** |  |  | wasteful closure upon raindrops and other non-living objects |  |  |  |  | nom avoidance «act transitive»: of=patient |

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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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