Pests: mice in the kitchen, cockroaches, clothes moths, fleas and head lice

Tests: 6 of 12 right · Exam: 2 of 4 right · Kind: plain · Understood: 11 of 16 · Run: 2026-10-18, commit f3c23ea72

Lesson 397 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.

Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.

Test 1 · right ✓

«ew, mice, just leave the cereal open, they'll go away» What is the best advice?

1. Keep food in tight boxes, so mice find nothing to eat — ← Mova's choice · ✓ the right answer · score 4
2. Mice only eat cheese — score 4
3. Mice hate cereal, so it is fine — no support
4. Leave more food out in the garden so they stay outside the house — score 0

Why: It took the question to ask which statement is true. It chose option 1 with score 4, tied with another option at 4 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 302, line 1: «An owl is a hunting machine built for the night. Its wing feathers have comb-like front edges and soft fringes, so it glides past you in a barn without a whisp…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «nothing» (+2); the same doer «mouse» (+1); a different action (counts against) (+1). · the question and its options parsed, with trees and pragmatics

Test 2 · wrong ✗

Count them: mum finds 3 fleas on the dog. How many legs, and how many wings?

1. 24 legs and 0 wings — ← Mova's choice · no support
2. 18 legs and 6 wings — no support
3. 12 legs and 6 wings — no support
4. 18 legs and 0 wings — ✓ the right answer · no support

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

Test 3 · right ✓

Count them: how is a flea different from a tick when you count legs?

1. A flea has 6 legs and a tick has 8 — ← Mova's choice · ✓ the right answer · no support
2. Both have 8 legs — no support
3. Both have 6 legs — no support
4. A flea has 8 legs and a tick has 6 — no support

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

Test 4 · right ✓

«cockroaches'd survive the end of the world, mate» What is the truth?

1. They are tough, but cold, heat and hunger still kill them, and other insects beat them at radiation — ← Mova's choice · ✓ the right answer · score 7
2. True, they cannot be killed by anything at all, not fire, not ice and not hunger, nothing ever — no support
3. True, they are made of metal — no support
4. False, they die from light — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 7, the only option with support. Its support: lesson 397, line 9: «Cockroaches survive more radiation than people but are not indestructible: many insects survive radiation better, and cold, heat and hunger still kill them; of…», reached through the same lesson line as the sentence the question matched. What matched: the same action «kill» (+4); a different thing acted on (counts against) (+2); the same doer «cold heat» (+1). · the question and its options parsed, with trees and pragmatics

Test 5 · wrong ✗

In a cartoon, a giant moth flies into a wardrobe and chews a jumper with big teeth. What is really eating the jumper?

1. Tiny moth caterpillars, because grown-up moths do not eat — ✓ the right answer · score 1
2. Nothing, jumpers get holes alone — no support
3. Grown-up moths, which have small sharp teeth hidden under their furry heads — ← Mova's choice · score 5
4. Mice hiding in the sleeves — no support

Why: It took the question to ask what it is done to. It chose option 3 with score 5, against 1 for the next best. Its support: lesson 43, line 12: «A platypus stuffs food from the riverbed into its cheek pouches and chews it at the surface with hard horny pads, because adults have no teeth; it must come up…», reached through a sentence linked to the one the question matched. What matched: it fills the role the question asks for (+3); the same thing acted on «teeth» (+2). The right option, 1, scored 1. · the question and its options parsed, with trees and pragmatics

Test 6 · wrong ✗

«Jake's got nits, his hair's filthy» What is the best correction?

1. Lice only live on dogs — ← Mova's choice · no support
2. Right, only dirty hair gets lice, so he should just wash it more — no support
3. Lice come from dirty pillows only — no support
4. Lice are not a sign of dirty hair; clean hair gets them too — ✓ the right answer · no support

Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 7 · right ✓

Three friends put their heads together over one phone. Why might lice spread?

1. Lice jump across from the phone screen onto anyone holding it — score 3
2. Lice fly between the screens — score 2
3. Lice crawl from hair to hair when heads touch — ← Mova's choice · ✓ the right answer · score 5
4. Phones make lice grow — no support

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 5, against 3 for the next best. Its support: lesson 397, line 13: «Head lice are tiny wingless insects that live only on people's heads; they cannot jump or fly, only crawl from hair to hair when heads touch, and they are not…», reached through the option's own match among the sentences about the question's things. What matched: the same action «crawl» (+2); the same circumstance (+2); the same place «hair» (+1). · the question and its options parsed, with trees and pragmatics

Test 8 · wrong ✗

What would happen if you wiped an ant trail with soapy water?

1. The ants would lose the smell trail and get confused — ✓ the right answer · score 4
2. Nothing, ants follow sight only — score 3
3. The ants would turn into flies — no support
4. The ants would follow it even faster, because they like the soap — ← Mova's choice · score 7

Why: It took the question to ask what happens next. It chose option 4 with score 7, against 4 for the next best. Its support: lesson 397, line 16: «Ants follow smell trails left by the first ant that found food, so wiping the trail with soapy water confuses them; ants are a nuisance but not dirty like cock…», reached through the same lesson line as the sentence the question matched. What matched: the same thing acted on «smell trails» (+3); the same action «follow» (+2); the same doer «ants» (+2). The right option, 1, scored 4. · the question and its options parsed, with trees and pragmatics

Test 9 · wrong ✗

The dog was given flea treatment but fleas keep coming back. What has been forgotten?

1. Giving the dog more food — no support
2. Taking the dog for much longer walks in the fields, away from other dogs — ← Mova's choice · score 2
3. Brushing the dog's teeth every night before bed — no support
4. Vacuuming carpets and washing the pet bed, where eggs and young live — ✓ the right answer · no support

Why: It took the question to ask what it is done to. It chose option 2 with score 2, the only option with support. Its support: lesson 325, line 6: «Before getting a pet, a family should agree who feeds it, cleans up, walks it, looks after it on holiday and pays for it; skipping these questions is why many…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+2); the same thing acted on «dog» (+1). Against it: a different action (counts against) (-1). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 10 · right ✓

«there's a spider in the bathroom, kill it!!» Why might you let it stay?

1. It scares all the mice out of the house — score 5
2. It eats flies and mosquitoes — ← Mova's choice · ✓ the right answer · score 12
3. It keeps the bath nice and clean — score 5
4. It makes the bath water warmer — score 5

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 12, against 5 for the next best. Its support: lesson 397, line 3: «The same animal can be a pest in one place and a helper in another: a house spider eats flies and mosquitoes, so many people let it stay.», reached through the cause of the sentence the question matched. What matched: the same thing acted on «flies» (+5); the same doer «house spider» (+4); the same action «eat» (+3). · the question and its options parsed, with trees and pragmatics

Test 11 · wrong ✗

Count them: 7 cockroaches run under the fridge. How many legs?

1. 28 — ← Mova's choice · no support
2. 56 — no support
3. 42 — ✓ the right answer · no support
4. 49 — no support

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

Test 12 · right ✓

Why would leaving crumbs on the floor at night be an invitation to cockroaches?

1. Cockroaches come out at night looking for crumbs — ← Mova's choice · ✓ the right answer · score 3
2. Crumbs scare cockroaches away — no support
3. Cockroaches eat only in daylight — no support
4. Crumbs make cockroaches sleepy, so they stay under the fridge — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 3, the only option with support. Its support: lesson 397, line 7: «Cockroaches hide in warm, damp, dark places and come out at night for crumbs; they run from light because darkness keeps them safe from predators.», reached through the option's own match among the sentences about the question's things. What matched: the same action «come out» (+2); the same property (+1). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · right ✓

Identify the principal reason for which house mice are able to gnaw through a wide variety of materials, including electrical wires.

1. Their saliva contains a substance which dissolves plastic and copper — no support
2. They possess an exceptional number of teeth — no support
3. Their teeth grow continuously throughout their lives — ← Mova's choice · ✓ the right answer · score 5
4. Their teeth are composed of metal — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 5, the only option with support. Its support: lesson 397, line 5: «House mice leave droppings like grains of rice and gnaw holes in packets when they move in for food and warmth; their teeth never stop growing, so they gnaw al…», reached through the same lesson line as the sentence the question matched. What matched: the same action «grow» (+4); the same doer «teeth» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · wrong ✗

Which of the following statements most accurately characterises the damage caused to woollen garments by clothes moths?

1. It is caused exclusively by the adult moths — ← Mova's choice · score 6
2. It is caused by the caterpillars, whereas the adult moths do not feed — ✓ the right answer · score 6
3. It is caused by mice concealed within wardrobes — no support
4. It is caused by spiders in the construction of webs — no support

Why: It took the question to ask who or what does it. It chose option 1 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 397, line 10: «Holes in wool jumpers are made by the caterpillars of clothes moths, not by the grown-up moths, which do not eat; the caterpillars eat wool, fur and feathers a…», 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 «grown moths» (+2); a different action (counts against) (+1). The right option, 2, scored 6. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · right ✓

Select the response consistent with the established facts concerning the transmission of head lice.

1. They are transmitted by flying between persons — no support
2. They are transmitted by jumping across considerable distances — no support
3. They are transmitted exclusively to persons with unwashed hair — no support
4. They are transmitted by crawling from hair to hair when heads come into contact — ← Mova's choice · ✓ the right answer · score 5

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 397, line 13: «Head lice are tiny wingless insects that live only on people's heads; they cannot jump or fly, only crawl from hair to hair when heads touch, and they are not…», reached through the option's own match among the sentences about the question's things. What matched: the same place «hair» (+3); the same circumstance (+3). Against it: the same action «crawl» (-1). · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

It is given that a flea possesses six legs and a tick possesses eight legs. Ascertain the total number of legs of two fleas and one tick.

1. Sixteen — ← Mova's choice · no support
2. Twenty-two — no support
3. Twenty — ✓ the right answer · no support
4. Fourteen — no support

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

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/397-pests-mice-in-the-kitchen-cockroaches-clothes-moths-fleas-and-head-lice/