---
title: Why is spider silk useful to the spider in a sticky web and a stretc… — Animal builders: spiders' webs and silk · tree and pragmatics
description: Why is spider silk useful to the spider in a sticky web and a stretchy line both? Test 9 of lesson 244 «Animal builders: spiders' webs and silk» 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 right.
---

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# Test 9 · Animal builders: spiders' webs and silk

<!-- .ven lang=en -->
Why is spider silk useful to the spider in a sticky web and a stretchy line both?

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **Who acts:** spider silk · **What happens:** be

<!-- .vabout -->
This is test 9 of lesson 244 «Animal builders: spiders' webs and silk» of the biology 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/biology/244-animal-builders-spiders-webs-and-silk/#t9).

## The question {#question}

```conllu
# sent_id = question:biology:244-animal-builders-spiders-webs-and-silk:t9:1
# text = Why is spider silk useful to the spider in a sticky web and a stretchy line both?
1	Why	why	ADV	WRB	PronType=Int	5	advmod	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
3	spider	spider	NOUN	NN	Number=Sing	4	compound	_	_
4	silk	silk	NOUN	NN	Number=Sing	5	nsubj	_	_
5	useful	useful	ADJ	JJ	Degree=Pos	0	root	_	_
6	to	to	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	spider	spider	NOUN	NN	Number=Sing	5	obl	_	_
9	in	in	ADP	IN	_	12	case	_	_
10	a	a	DET	DT	Definite=Ind|PronType=Art	12	det	_	_
11	sticky	sticky	ADJ	JJ	Degree=Pos	12	amod	_	_
12	web	web	NOUN	NN	Number=Sing	8	nmod	_	_
13	and	and	CCONJ	CC	_	16	cc	_	_
14	a	a	DET	DT	Definite=Ind|PronType=Art	16	det	_	_
15	stretchy	stretchy	ADJ	JJ	Degree=Pos	16	amod	_	_
16	line	line	NOUN	NN	Number=Sing	8	conj	_	_
17	both	both	DET	DT	PronType=Tot	8	nmod	_	SpaceAfter=No
18	?	?	PUNCT	.	_	5	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | spider silk |  |  |  |  | to the spider in a sticky web  both and a stretchy line; useful *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 {#o1}

<!-- .ven lang=en -->
Silk changes by itself with the weather

```conllu
# sent_id = question:biology:244-animal-builders-spiders-webs-and-silk:t9:o1:1
# text = Silk changes by itself with the weather
1	Silk	silk	NOUN	NN	Number=Sing	2	nsubj	_	_
2	changes	change	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	by	by	ADP	IN	_	4	case	_	_
4	itself	itself	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs|Reflex=Yes	2	obl	_	_
5	with	with	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	weather	weather	NOUN	NN	Number=Sing	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **change** | present | Silk |  |  |  |  | by Silk; with the weather | vn dress-41.1.1-1-1 «NP V»: agent=Agent |

### Option 2 {#o2}

<!-- .ven lang=en -->
All silk is exactly the same

```conllu
# sent_id = question:biology:244-animal-builders-spiders-webs-and-silk:t9:o2:1
# text = All silk is exactly the same
1	All	all	DET	DT	PronType=Tot	2	det	_	_
2	silk	silk	NOUN	NN	Number=Sing	6	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
4	exactly	exactly	ADV	RB	_	6	advmod	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	same	same	ADJ	JJ	Degree=Pos	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | all silk |  |  |  |  | exactly, same *property* | tree rules |

### Option 3 · ← Mova's choice · ✓ the right answer {#o3}

<!-- .ven lang=en -->
The spider makes different kinds of silk for different jobs

```conllu
# sent_id = question:biology:244-animal-builders-spiders-webs-and-silk:t9:o3:1
# text = The spider makes different kinds of silk for different jobs
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	spider	spider	NOUN	NN	Number=Sing	3	nsubj	_	_
3	makes	make	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	different	different	ADJ	JJ	Degree=Pos	5	amod	_	_
5	kinds	kind	NOUN	NNS	Number=Plur	3	obj	_	_
6	of	of	ADP	IN	_	7	case	_	_
7	silk	silk	NOUN	NN	Number=Sing	5	nmod	_	_
8	for	for	ADP	IN	_	10	case	_	_
9	different	different	ADJ	JJ	Degree=Pos	10	amod	_	_
10	jobs	job	NOUN	NNS	Number=Plur	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present | the spider | different kinds of silk |  |  |  | for different jobs | vn build-26.1-1 «NP V NP P.asset»: agent=Agent kind=Product for job=Asset |

### Option 4 {#o4}

<!-- .ven lang=en -->
The spider buys silk from other spiders

```conllu
# sent_id = question:biology:244-animal-builders-spiders-webs-and-silk:t9:o4:1
# text = The spider buys silk from other spiders
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	spider	spider	NOUN	NN	Number=Sing	3	nsubj	_	_
3	buys	buy	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	silk	silk	NOUN	NN	Number=Sing	3	obj	_	_
5	from	from	ADP	IN	_	7	case	_	_
6	other	other	ADJ	JJ	Degree=Pos	7	amod	_	_
7	spiders	spider	NOUN	NNS	Number=Plur	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **buy** | present | the spider | silk |  | other spiders |  |  | vn get-13.5.1 «NP V NP PP.source»: agent=Agent silk=Theme from spider=Source |

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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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