---
title: Silkworms and goldfish: two animals China changed — how Mova does on the tests · Biology
description: Lesson 381 of the biology course of Mova's primary school: 7 of 11 tests right, exam 1 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Silkworms and goldfish: two animals China changed

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**Tests:** 7 of 11 right · **Exam:** 1 of 4 right · **Kind:** plain · **Understood:** 8 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 381 of the biology course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: [the lesson in the corpora](https://md.mova.elamur.ai/free/en/corpora/school/biology/381-silkworms-and-goldfish-two-animals-china-changed/).

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Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/).

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### Test 1 · right ✓ {#t1}

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«silkworms are just worms innit, like in the garden» What is right?

- **1.** Yes, they are earthworms that spin silk out of mud — no support
- **2.** No, they are caterpillars that turn into moths — **← Mova's choice** · **✓ the right answer** · score 3
- **3.** No, they are baby snakes — no support
- **4.** Yes, they live in soil — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 3, the only option with support. Its support: lesson 381, line 6: «Silkworms are the caterpillars of the domestic silk moth, and they eat almost nothing but fresh mulberry leaves.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «caterpillars» (+2); the same light verb (be, have, do, get, go) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t1/)

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### Test 2 · right ✓ {#t2}

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Count them: a tray has 5 silkworms, each with 16 legs in all. How many legs is that?

- **1.** 80 — **← Mova's choice** · **✓ the right answer** · no support
- **2.** 50 — no support
- **3.** 60 — no support
- **4.** 30 — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t2/)

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### Test 3 · right ✓ {#t3}

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«ok so when it turns into a moth how many legs does it lose» Answer for one silkworm.

- **1.** Ten — **← Mova's choice** · **✓ the right answer** · no support
- **2.** None — no support
- **3.** Six — no support
- **4.** Sixteen — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t3/)

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### Test 4 · right ✓ {#t4}

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What would happen if a farmer let silk moths go free in a forest?

- **1.** They would fly back home every evening to the farmer's warm shed to sleep — score 1
- **2.** They would spread and take over the forest — score 1
- **3.** They would turn wild and grow bigger — score 1
- **4.** They would soon die, as they cannot fly or fend for themselves — **← Mova's choice** · **✓ the right answer** · score 7

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**Why:** It took the question to ask what happens next. It chose option 4 with score 7, against 1 for the next best. Its support: lesson 381, line 2: «Farmers always chose the calmest worms that made the best silk, generation after generation, until the silk moth could no longer live without people: it cannot…», reached through what followed the sentence the question matched. What matched: the same action «fly» (+6); the same doer «moth» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t4/)

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### Test 5 · right ✓ {#t5}

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In a cartoon a silkworm knits a jumper with knitting needles. What does a real silkworm do?

- **1.** Spins one long thread round itself to make a cocoon — **← Mova's choice** · **✓ the right answer** · score 8
- **2.** Weaves cloth for people on a tiny loom of leaves — no support
- **3.** Spins webs to catch flies — score 3
- **4.** Knits silk with its front legs — no support

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**Why:** It took the question to ask what is done. It chose option 1 with score 8, against 3 for the next best. Its support: lesson 381, line 10: «A silkworm spins a cocoon from one single thread of liquid silk over two or three days, and the thread can be longer than five football pitches.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «cocoon» (+4); the same doer «silkworm» (+3); a different action (counts against) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t5/)

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### Test 6 · right ✓ {#t6}

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«that cocoon's tiny, the thread must be like 2 cm» What is right?

- **1.** Yes, it is about 2 cm long — no support
- **2.** One thread can be longer than five football pitches — **← Mova's choice** · **✓ the right answer** · score 5
- **3.** It is as long as one ruler — score 2
- **4.** It is made of no thread at all, only of dried hardened spit — score 5

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 5, tied with another option at 5 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 381, line 10: «A silkworm spins a cocoon from one single thread of liquid silk over two or three days, and the thread can be longer than five football pitches.», reached through the option's own match among the sentences about the question's things. What matched: the same circumstance (+3); the same property (+1); the same light verb (be, have, do, get, go) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t6/)

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### Test 7 · right ✓ {#t7}

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«my bro says silk comes from a plant like cotton» What is right?

- **1.** No, silk is a protein spun by the silkworm — **← Mova's choice** · **✓ the right answer** · score 3
- **2.** Yes, from cotton flowers — no support
- **3.** No, it comes from sheep — score 1
- **4.** Yes, from the bark of the mulberry tree that silkworms eat — score -1

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 3, against 1 for the next best. Its support: lesson 38, line 8: «Spider silk is a protein made as a liquid and pulled out through spinnerets; some silk is stronger than steel of the same weight and can stretch a lot.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «protein» (+2); the same light verb (be, have, do, get, go) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t7/)

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### Test 8 · wrong ✗ {#t8}

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Count them: 3 wild goldfish and 2 fantails swim in a pond. How many tail fins in all?

- **1.** Five — **← Mova's choice** · no support
- **2.** Six — no support
- **3.** Seven — **✓ the right answer** · no support
- **4.** Ten — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t8/)

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### Test 9 · wrong ✗ {#t9}

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«gonna tip my goldfish in the lake, it'll be happier there» What is the best answer?

- **1.** Yes, but only in winter — **← Mova's choice** · no support
- **2.** Yes, goldfish belong in lakes — no support
- **3.** Fine, it will turn back into a wild carp in a week or two — no support
- **4.** No, it can harm wild fish; ask a pet shop or rehome it — **✓ the right answer** · no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t9/)

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### Test 10 · wrong ✗ {#t10}

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Why are dumped goldfish often dull-coloured again after a few generations in a lake?

- **1.** The lake water slowly washes the bright colour off their scales — no support
- **2.** Fish lose colour when they are happy — score 1
- **3.** Bright fish are easier for birds to catch, so dull ones survive — **✓ the right answer** · score 3
- **4.** They eat too many plants — **← Mova's choice** · score 8

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**Why:** It took the question to ask why something happens (its cause). It chose option 4 with score 8, against 3 for the next best. Its support: lesson 381, line 17: «Goldfish dumped in lakes can grow as big as a football, eat other fishes' eggs, stir up mud and crowd out native fish, and over generations they often turn dul…», reached through the same lesson line as the sentence the question matched. What matched: the same action «eat» (+6); the same doer «goldfish» (+2). The right option, 3, scored 3. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t10/)

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### Test 11 · wrong ✗ {#t11}

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«bubble-eye goldfish must be the best swimmers, look at em» What is right?

- **1.** Yes, the bubbles help them float and swim much faster — **← Mova's choice** · score 3
- **2.** Yes, they live wild in rivers — no support
- **3.** No, many fancy kinds swim slowly or see badly — **✓ the right answer** · no support
- **4.** No, they cannot swim at all — score -2

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 3, against -2 for the next best. Its support: lesson 140, line 11: «Labradors and Newfoundlands are water rescue dogs with water-resistant coats, webbed toes and strong swimming muscles; in Italy trained dogs jump from helicopt…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «swimmers» (+2); the same action «help» (+1). The right option, 3, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/t11/)

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### Exam question 1 · formal language · wrong ✗ {#e1}

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Select the response consistent with the established facts concerning the domestic silk moth.

- **1.** It is a vigorous flier abundant in the wild forests of Asia and Europe — no support
- **2.** It subsists principally upon insects — **← Mova's choice** · score 1
- **3.** It is incapable of proper flight and wholly dependent upon human beings — **✓ the right answer** · no support
- **4.** It constructs its cocoon from mud and leaves — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 1, the only option with support. Its support: lesson 381, line 7: «The domestic silk moth cannot fly properly and no longer lives in the wild; it depends on people completely.», reached through the option's own match among the sentences about the question's things. What matched: the same action «live» (+1). The right option, 3, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/e1/)

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### Exam question 2 · formal language · wrong ✗ {#e2}

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Ascertain the aggregate number of true legs and prolegs possessed by a single silkworm.

- **1.** Eight — **← Mova's choice** · no support
- **2.** Sixteen — **✓ the right answer** · no support
- **3.** Ten — no support
- **4.** Six — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/e2/)

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### Exam question 3 · formal language · right ✓ {#e3}

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Identify the principal reason for which the colours of the goldfish were intensified over the centuries.

- **1.** Selective breeding by human keepers of the brightest individuals — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Exposure to strong sunlight in shallow ponds — no support
- **3.** A sudden change in the climate of East Asia — no support
- **4.** A diet consisting exclusively of orange foodstuffs supplied by monks — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/e3/)

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### Exam question 4 · formal language · wrong ✗ {#e4}

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Which of the following statements most accurately characterises the consequences of releasing goldfish into natural waters?

- **1.** They transform into a different species forthwith — **← Mova's choice** · no support
- **2.** They invariably perish within a single day — no support
- **3.** They may attain great size and harm native fish populations — **✓ the right answer** · no support
- **4.** They purify the water to the benefit of all species — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/381-silkworms-and-goldfish-two-animals-china-changed/e4/)

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