---
title: Worms, snails and slugs — how Mova does on the tests · Biology
description: Lesson 217 of the biology course of Mova's primary school: 5 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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# Worms, snails and slugs

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**Tests:** 5 of 11 right · **Exam:** 1 of 4 right · **Kind:** ★ · **Understood:** 9 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 217 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/217-worms-snails-and-slugs/).

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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/217-worms-snails-and-slugs/).

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### Test 1 · ★ · right ✓ {#t1}

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«mate chopped a worm in half with his spade, says now he's got 2 worms lol» What is right?

- **1.** No, they do not become two worms; at best the head end lives and grows a new tail — **← Mova's choice** · **✓ the right answer** · score 8
- **2.** Yes, every cut worm turns into two — score 5
- **3.** No, cut worms just wriggle about and join back up — no support
- **4.** Yes, and the two halves will grow up to be twin worms — no support

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 8, against 5 for the next best. Its support: lesson 217, line 7: «A worm cut in half does not become two worms; sometimes the head end survives and grows a new tail, but the tail end usually dies.», reached through the same lesson line as the sentence the question matched. What matched: the same action «grow» (+3); the same thing acted on «new tail» (+3); the same doer «head end» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/217-worms-snails-and-slugs/t1/)

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### Test 2 · ★ · right ✓ {#t2}

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In a cartoon a smiling worm wears glasses to read a book. What is true about real worms?

- **1.** Real worms have no eyes but feel light with their skin — **← Mova's choice** · **✓ the right answer** · score 7
- **2.** Real worms see very well in the dark, much better than cats — no support
- **3.** Real worms have eyes on stalks, just like snails do — score 6
- **4.** Real worms have two tiny blue eyes — score 6

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 7, against 6 for the next best. Its support: lesson 217, line 8: «An earthworm has no eyes and no lungs; it breathes through its moist skin and can sense light with its skin.», reached through the option's own match among the sentences about the question's things. What matched: the same action «sense» (+3); the same doer «worm» (+2); the same circumstance (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/217-worms-snails-and-slugs/t2/)

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### Test 3 · ★ · wrong ✗ {#t3}

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What would happen to an earthworm left on a hot, dry pavement all afternoon?

- **1.** It would slowly turn into a slug — score 5
- **2.** Nothing, worms love dry heat and lie in the sun — no support
- **3.** It would dry out and could not breathe through its skin — **✓ the right answer** · score 5
- **4.** It would grow a hard shell to save itself from the heat — **← Mova's choice** · score 6

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 6, against 5 for the next best. Its support: lesson 47, line 12: «Earthworms pull dead leaves underground and turn them into rich worm casts, and their tunnels let air and water into the soil; Charles Darwin wrote a whole boo…», reached through the option's own match among the sentences about the question's things. What matched: the same action «turn» (+3); the same doer «earthworms» (+2); a different thing acted on (counts against) (+1). The right option, 3, scored 5. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/217-worms-snails-and-slugs/t3/)

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### Test 4 · ★ · wrong ✗ {#t4}

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Count them: 4 garden snails crawl up a wall. How many eye-tentacles and how many feet altogether?

- **1.** 4 eye-tentacles and 4 feet — **← Mova's choice** · no support
- **2.** 8 eye-tentacles and 16 feet — no support
- **3.** 8 eye-tentacles and 4 feet — **✓ the right answer** · no support
- **4.** 16 eye-tentacles and 8 feet — 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/217-worms-snails-and-slugs/t4/)

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### Test 5 · ★ · wrong ✗ {#t5}

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«my nan says slugs are just snails that got kicked outta their shells» Is she right?

- **1.** No, slugs are really a kind of worm — no support
- **2.** No, slugs are a separate kind that has no outside shell — **✓ the right answer** · no support
- **3.** Yes, slugs find empty old shells to move into — no support
- **4.** Yes, a snail that loses its shell becomes a slug — **← Mova's choice** · score 5

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 5, the only option with support. Its support: lesson 177, line 9: «The scaly-foot snail has a shell and scales made of iron sulfide, the only animal known to build armour from it, which may protect it from crabs and other pred…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «shell» (+3); the same doer «foot snail» (+2). The right option, 2, 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/217-worms-snails-and-slugs/t5/)

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### Test 6 · ★ · wrong ✗ {#t6}

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A gardener counts 0 worms in one field and 300 in another. Which field probably has the richest soil?

- **1.** The one with 300 worms — **✓ the right answer** · score 5
- **2.** Worms make no difference to soil — **← Mova's choice** · score 6
- **3.** Both are the same — no support
- **4.** The one with no worms — score 5

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**Why:** It took the question to ask who or what does it. It chose option 2 with score 6, against 5 for the next best. Its support: lesson 217, line 2: «These soft little animals have no bones at all: a worm moves by squeezing and stretching its rings while tiny bristles grip the soil, and a snail glides along…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same doer «worm» (+2); a different action (counts against) (+1). The right option, 1, scored 5. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/217-worms-snails-and-slugs/t6/)

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### Test 7 · ★ · wrong ✗ {#t7}

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«worm's got loads of legs, look, it's walking» What is really helping it grip?

- **1.** Tiny bristles on its rings — **✓ the right answer** · no support
- **2.** Its long sharp teeth — **← Mova's choice** · score 6
- **3.** Sticky slime from its eyes — no support
- **4.** Hundreds of little legs — no support

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**Why:** It took the question to ask what it is done to. It chose option 2 with score 6, the only option with support. Its support: lesson 177, line 7: «Giant tubeworms have no mouth and no gut; bacteria living inside them make food from chemicals in the vent water, and the worms can grow over two metres long.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «worms» (+4); the same property (+3). Against it: a different action (counts against) (-1). The right option, 1, 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/217-worms-snails-and-slugs/t7/)

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### Test 8 · ★ · right ✓ {#t8}

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You find a pile of broken snail shells round one flat stone. What has probably happened?

- **1.** A thrush has been cracking snails on its anvil — **← Mova's choice** · **✓ the right answer** · no support
- **2.** The snails all crashed into the stone in the dark — no support
- **3.** The snails left their old shells there to grow new ones — no support
- **4.** Children threw the snails there — 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/217-worms-snails-and-slugs/t8/)

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### Test 9 · ★ · right ✓ {#t9}

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What would happen if you gently touched a snail's long tentacles?

- **1.** It would grow two more tentacles to protect itself — score 4
- **2.** It would pull them in, because its eyes are at the tips — **← Mova's choice** · **✓ the right answer** · score 7
- **3.** It would bite your finger hard — no support
- **4.** It would leave its shell behind and run away to hide — score 1

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**Why:** It took the question to ask what happens next. It chose option 2 with score 7, against 4 for the next best. Its support: lesson 217, line 13: «A garden snail has eyes at the tips of its two long tentacles, which it pulls in when they are touched; the two short tentacles below are for smell and touch.», reached through the same lesson line as the sentence the question matched. What matched: the same action «pull in» (+4); the same thing acted on «two long tentacles» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/217-worms-snails-and-slugs/t9/)

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### Test 10 · ★ · right ✓ {#t10}

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«bloody slugs ate all my lettuce last night, where are they now??» Where should she look in the morning?

- **1.** Under pots and stones in damp, dark spots — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Inside the lettuce leaves in the hot sun — no support
- **3.** Out on the sunny path, sunbathing — no support
- **4.** High up in the trees with the birds — 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/217-worms-snails-and-slugs/t10/)

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### Test 11 · ★ · wrong ✗ {#t11}

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Count them: a worm, a snail and a slug race on the path. How many legs is that altogether?

- **1.** Twelve — **← Mova's choice** · no support
- **2.** Eight — no support
- **3.** Three — no support
- **4.** None — **✓ 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/217-worms-snails-and-slugs/t11/)

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

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Identify the principal means by which respiration is accomplished in the earthworm.

- **1.** Water is passed across gills situated near the head of the animal — **← Mova's choice** · no support
- **2.** Air is admitted through an aperture situated at the posterior end — no support
- **3.** Gaseous exchange occurs through the moist surface of the skin — **✓ the right answer** · no support
- **4.** Air is drawn into a pair of internal lungs — 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/217-worms-snails-and-slugs/e1/)

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

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Which of the following statements most accurately characterises the consequence of bisecting an earthworm?

- **1.** The worm sustains no injury whatsoever, since it possesses no capacity for sensation — **← Mova's choice** · score -2
- **2.** Two complete and independent worms are invariably produced from the halves — no support
- **3.** The two portions subsequently reunite into a single worm — no support
- **4.** Two complete worms are not produced, and the posterior portion generally perishes — **✓ the right answer** · no support

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**Why:** It took the question to ask who or what does it. It chose option 1 with score -2, the only option with support. Its support: lesson 216, line 5: «Robins follow gardeners because digging brings worms and insects to the surface, and in the wild they follow wild boar for the same reason.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+2). Against it: a different thing acted on (counts against) (-1); a different action (counts against) (-3). The right option, 4, 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/217-worms-snails-and-slugs/e2/)

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

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Select the response consistent with the established facts concerning the location of the visual organs of the garden snail.

- **1.** They are situated at the extremities of the longer pair of tentacles — **← Mova's choice** · **✓ the right answer** · no support
- **2.** They are situated upon the anterior surface of the shell — no support
- **3.** They are situated at the extremities of the shorter pair of tentacles — no support
- **4.** They are situated beneath the muscular foot — 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/217-worms-snails-and-slugs/e3/)

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

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Ascertain the reason for which the song thrush strikes snails against a particular stone.

- **1.** Other birds are thereby warned to vacate the territory — no support
- **2.** The snail is thereby encouraged to vacate its shell voluntarily — **← Mova's choice** · score 5
- **3.** The shell is thereby fractured so that the soft body may be consumed — **✓ the right answer** · no support
- **4.** The mucus is thereby removed prior to the construction of a nest of shells — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 5, the only option with support. Its support: lesson 177, line 9: «The scaly-foot snail has a shell and scales made of iron sulfide, the only animal known to build armour from it, which may protect it from crabs and other pred…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «shell» (+3); the same doer «foot snail» (+2). 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/217-worms-snails-and-slugs/e4/)

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- ← previous: [216. Garden birds: robins, blackbirds, tits and feeders](https://md.mova.elamur.ai/free/en/school-run/biology/216-garden-birds-robins-blackbirds-tits-and-feeders/)
- next →: [218. Bees and wasps in the garden](https://md.mova.elamur.ai/free/en/school-run/biology/218-bees-and-wasps-in-the-garden/)
- ↑ back to [Biology](https://md.mova.elamur.ai/free/en/school-run/biology/)