---
title: Identify the principal method by which the baiji located its prey wi… — China's great rivers: the finless porp… · tree and pragmatics
description: Identify the principal method by which the baiji located its prey within the turbid waters of the Yangtze. Exam question 1 of lesson 379 «China's great rivers: the finless porpoise, the lost baiji, Chinese alligators and sturgeon» of the biology course of Mova's primary school, with the dependency t
---

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# Exam question 1 · China's great rivers: the finless porpoise, the lost baiji…

<!-- .ven lang=en -->
Identify the principal method by which the baiji located its prey within the turbid waters of the Yangtze.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **Who acts:** you, baiji · **What happens:** identify, locate · **To what, where:** principal method, prey

<!-- .vabout -->
This is exam question 1 of lesson 379 «China's great rivers: the finless porpoise, the lost baiji, Chinese alligators and sturgeon» 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/379-china-s-great-rivers-the-finless-porpoise-the-lost-baiji-chinese-alligators-and-sturgeon/#e1).

## The question {#question}

```conllu
# sent_id = question:biology:379-china-s-great-rivers-the-finless-porpoise-the-lost-baiji-chinese-alligators-and-sturgeon:e1:1
# text = Identify the principal method by which the baiji located its prey within the turbid waters of the Yangtze.
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	method	method	NOUN	NN	Number=Sing	1	obj	_	_
5	by	by	ADP	IN	_	6	case	_	_
6	which	which	PRON	WDT	PronType=Rel	9	obl	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	baiji	baiji	NOUN	NN	Number=Sing	9	nsubj	_	_
9	located	locate	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	4	acl:relcl	_	_
10	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	11	nmod:poss	_	_
11	prey	prey	NOUN	NN	Number=Sing	9	obj	_	_
12	within	within	ADP	IN	_	15	case	_	_
13	the	the	DET	DT	Definite=Def|PronType=Art	15	det	_	_
14	turbid	turbid	ADJ	JJ	Degree=Pos	15	amod	_	_
15	waters	water	NOUN	NNS	Number=Plur	9	obl	_	_
16	of	of	ADP	IN	_	18	case	_	_
17	the	the	DET	DT	Definite=Def|PronType=Art	18	det	_	_
18	Yangtze	Yangtze	PROPN	NNP	Number=Sing	15	nmod	_	SpaceAfter=No
19	.	.	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 method |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent method=Theme |
| 2 | **locate** | past | the baiji | baiji's prey |  |  |  | by the principal method; within the turbid waters of the Yangtze | 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 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
By tracking the movement of birds

```conllu
# sent_id = question:biology:379-china-s-great-rivers-the-finless-porpoise-the-lost-baiji-chinese-alligators-and-sturgeon:e1:o1:1
# text = By tracking the movement of birds
1	By	by	SCONJ	IN	_	2	mark	_	_
2	tracking	track	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	movement	movement	NOUN	NN	Number=Sing	2	obj	_	_
5	of	of	ADP	IN	_	6	case	_	_
6	birds	bird	NOUN	NNS	Number=Plur	4	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **track** | gerund |  | the movement of birds |  |  |  |  | vn stalk-35.3 «NP V NP»: agent=Agent movement=Theme |
| 2 | **move** |  |  | birds |  |  |  |  | nom movement «act transitive»: of=patient |

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
By the emission of clicks and the interpretation of returning echoes

```conllu
# sent_id = question:biology:379-china-s-great-rivers-the-finless-porpoise-the-lost-baiji-chinese-alligators-and-sturgeon:e1:o2:1
# text = By the emission of clicks and the interpretation of returning echoes
1	By	by	ADP	IN	_	3	case	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	emission	emission	NOUN	NN	Number=Sing	0	root	_	_
4	of	of	ADP	IN	_	5	case	_	_
5	clicks	click	NOUN	NNS	Number=Plur	3	nmod	_	_
6	and	and	CCONJ	CC	_	8	cc	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	interpretation	interpretation	NOUN	NN	Number=Sing	5	conj	_	_
9	of	of	ADP	IN	_	11	case	_	_
10	returning	return	VERB	VBG	VerbForm=Ger	11	amod	_	_
11	echoes	echo	NOUN	NNS	Number=Plur	8	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **return** | gerund |  |  |  |  |  |  | vn escape-51.1-1 «NP V»: agent=Theme |
| 2 | **emit** |  |  | clicks and the interpretation of returning echoes |  |  |  |  | nom emission «act transitive»: of=patient |
| 3 | **interpret** |  |  | returning echoes |  |  |  |  | nom interpretation «cognition transitive»: of=patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
By acute vision

```conllu
# sent_id = question:biology:379-china-s-great-rivers-the-finless-porpoise-the-lost-baiji-chinese-alligators-and-sturgeon:e1:o3:1
# text = By acute vision
1	By	by	ADP	IN	_	3	case	_	_
2	acute	acute	ADJ	JJ	Degree=Pos	3	amod	_	_
3	vision	vision	NOUN	NN	Number=Sing	0	root	_	_
```

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

### Option 4 {#o4}

<!-- .ven lang=en -->
By the sense of smell alone

```conllu
# sent_id = question:biology:379-china-s-great-rivers-the-finless-porpoise-the-lost-baiji-chinese-alligators-and-sturgeon:e1:o4:1
# text = By the sense of smell alone
1	By	by	ADP	IN	_	3	case	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	sense	sense	NOUN	NN	Number=Sing	0	root	_	_
4	of	of	ADP	IN	_	5	case	_	_
5	smell	smell	NOUN	NN	Number=Sing	3	nmod	_	_
6	alone	alone	ADV	RB	_	5	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **sense** |  |  | smell |  |  |  |  | nom sense «cognition 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.

<!-- /div -->

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