---
title: More builders: caddis cases, paper wasps, moles, apes' beds and sand… — how Mova does on the tests · Biology
description: Lesson 245 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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# More builders: caddis cases, paper wasps, moles, apes' beds and sand circles

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

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Lesson 245 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/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/).

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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/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/).

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### Test 1 · right ✓ {#t1}

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«molehill on the lawn again, my dad says the mole just builds mountains for fun» What is right?

- **1.** No, rabbits make molehills — no support
- **2.** No, the heaps are soil pushed up from its tunnels — **← Mova's choice** · **✓ the right answer** · score 3
- **3.** Yes, to show off to other moles — no support
- **4.** Yes, moles build hills to climb and look around — 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 245, line 9: «Moles dig tunnels and push the soil up into molehills; worms fall into the tunnels and the mole patrols them, and it keeps a larder of worms with bitten heads.», reached through the option's own match among the sentences about the question's things. What matched: the same action «push up» (+4); the same thing acted on «soil» (+1). Against it: a different doer (counts against) (-2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t1/)

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### Test 2 · wrong ✗ {#t2}

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«found an old wasp nest in the shed, will they come back to it next yr?»

- **1.** No, an old nest is not used again — **✓ the right answer** · score 5
- **2.** Yes, the same wasps return every spring — no support
- **3.** Yes, they sleep inside it all winter — **← Mova's choice** · score 7
- **4.** Only if you paint it a bright colour — no support

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**Why:** It took the question to ask which statement is true. It chose option 3 with score 7, against 5 for the next best. Its support: lesson 12, line 3: «Every animal has its own trick for the cold months: the squirrel buries acorns, the hedgehog sleeps through winter in a nest of leaves, the owl keeps hunting i…», reached through the option's own match among the sentences about the question's things. What matched: the same action «sleep» (+4); the same property (+3). 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/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t2/)

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### Test 3 · wrong ✗ {#t3}

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«2 chimps, 3 orangutans in the zoo. how many arms then»

- **1.** 12 — **← Mova's choice** · no support
- **2.** 10 — **✓ the right answer** · no support
- **3.** 5 — no support
- **4.** 20 — 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/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t3/)

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### Test 4 · right ✓ {#t4}

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«4 hedgehogs under the leaves, no sorry 3. how many legs»

- **1.** 12 — **← Mova's choice** · **✓ the right answer** · no support
- **2.** 9 — no support
- **3.** 16 — no support
- **4.** 6 — 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/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t4/)

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### Test 5 · wrong ✗ {#t5}

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What would happen to a hummingbird nest if it were glued with hard mud instead of spider silk?

- **1.** The eggs would hatch faster than usual — **← Mova's choice** · no support
- **2.** It would float away — no support
- **3.** It could not stretch as the chicks grew — **✓ the right answer** · no support
- **4.** Nothing would change at all — 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/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t5/)

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### Test 6 · right ✓ {#t6}

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«found the hornets nest under the roof, kill the queen in spring and that's the lot?» What is true?

- **1.** Hornets have no queen — no support
- **2.** The old queen lives on in the old nest for ever — score 6
- **3.** All the hornets survive the winter together, huddled in the nest — score 5
- **4.** Each surviving young queen starts a new nest alone in spring — **← Mova's choice** · **✓ the right answer** · score 10

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 10, against 6 for the next best. Its support: lesson 245, line 8: «Hornets build big paper nests, but only the young queens survive the winter; in spring each queen starts a new nest alone, and an old nest is not used again.», reached through the option's own match among the sentences about the question's things. What matched: the same action «start» (+4); the same property (+3); the same doer «queen» (+2); the same thing acted on «new nest» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t6/)

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### Test 7 · right ✓ {#t7}

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A study compared chimp nests with human beds. What did it find?

- **1.** Human beds were always cleaner — no support
- **2.** Chimp nests were full of fleas — no support
- **3.** Chimps prefer to sleep in human beds — no support
- **4.** Chimp nests had fewer bugs — **← Mova's choice** · **✓ the right answer** · score 6

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**Why:** It took the question to ask what it is done to. It chose option 4 with score 6, the only option with support. Its support: lesson 245, line 10: «Chimpanzees and other great apes bend branches into a fresh sleeping nest each night, off the cold ground and away from leopards, and a study found chimp nests…», reached through what was said in the sentence the question matched. What matched: the same light verb (be, have, do, get, go) (+3); it fills the role the question asks for (+3); the same thing acted on «fewer bugs» (+1). Against it: the same doer «chimp nests» (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t7/)

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### Test 8 · wrong ✗ {#t8}

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«weird circle in the sand, aliens??» a diver says. What made it?

- **1.** A small male pufferfish using its fins — **✓ the right answer** · score -4
- **2.** A whale rolling on the sand — **← Mova's choice** · score 4
- **3.** Aliens landing their round spaceship in the sea — no support
- **4.** The tide going round — no support

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**Why:** It took the question to ask who or what does it. It chose option 2 with score 4, against -4 for the next best. Its support: lesson 235, line 7: «In Shark Bay, Australia, some dolphins wear sea sponges on their snouts to protect them while they poke in the sand, and mothers pass the trick to their young;…», reached through the option's own match among the sentences about the question's things. What matched: it fills the role the question asks for (+3); the same doer «dolphins» (+2). Against it: a different action (counts against) (-1). The right option, 1, scored -4. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t8/)

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### Test 9 · right ✓ {#t9}

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Why did nobody need to teach wasps to make paper?

- **1.** Wasps copy paper from the old newspapers in people's rubbish bins — score 3
- **2.** Wasps buy paper from paper mills — score 3
- **3.** Wasps made paper from wood millions of years before people did — **← Mova's choice** · **✓ the right answer** · score 8
- **4.** People taught wasps how to make it in the 1800s — score 8

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**Why:** It took the question to ask why something happens (its cause). It chose option 3 with score 8, tied with another option at 8 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 245, line 7: «Wasps chew wood fibres with spit into paper and build nests of six-sided cells; the paper layers trap air and keep the nest warm, and wasps have done this for…», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+5); the same thing acted on «paper» (+2); a different doer (counts against) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t9/)

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### Test 10 · right ✓ {#t10}

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A young orangutan is four years old. Who does it most likely live with?

- **1.** Its mother, who teaches it nest skills — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Alone in its own tree from the day it is born — no support
- **3.** Zookeepers only — no support
- **4.** A big group of male orangutans — 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/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t10/)

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### Test 11 · right ✓ {#t11}

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A bird sits on a wood ants' nest and lets ants climb on it. Why might it do that?

- **1.** It is stuck in the nest and cannot fly away again — score 5
- **2.** It is building its own nest there — score 1
- **3.** The ants' acid may clean parasites off its feathers — **← Mova's choice** · **✓ the right answer** · score 6
- **4.** It is trying to hatch the ant eggs — score 0

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**Why:** It took the question to ask why something happens (its cause). It chose option 3 with score 6, against 5 for the next best. Its support: lesson 241, line 4: «Other teams are made of two different kinds of animal: a little cleaner fish picks parasites off a big fish, and a bird rides a buffalo eating its ticks; both…», reached through a sentence linked to the one the question matched. What matched: the same action «pick» (+3); the same thing acted on «parasites» (+2); a different doer (counts against) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/t11/)

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

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Which of the following statements most accurately characterises the case constructed by the caddis fly larva?

- **1.** A portable shelter of particles bound with silk, affording protection from predatory fish — **✓ the right answer** · no support
- **2.** A structure of wax secreted from the abdomen — no support
- **3.** A fixed dwelling cemented firmly to the bed of the pond — no support
- **4.** A borrowed shell of a deceased snail, enlarged with mud and pebbles gathered from the stream bed — **← Mova's choice** · score 5

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**Why:** It took the question to ask who or what does it. It chose option 4 with score 5, the only option with support. Its support: lesson 245, line 6: «Caddis fly larvae glue sand grains, tiny shells or plant bits together with silk into a case they carry about, which protects their soft bodies from fish; an 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 «grains» (+2). 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/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/e1/)

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### Exam question 2 · formal language · right ✓ {#e2}

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Identify the principal material employed by wasps in the construction of their nests.

- **1.** Wood fibres masticated with saliva to form paper — **← Mova's choice** · **✓ the right answer** · score 6
- **2.** Mud collected from the margins of ponds and streams — no support
- **3.** Leaves joined together with spider silk — no support
- **4.** Wax secreted in the manner of the honeybee — no support

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 6, the only option with support. Its support: lesson 245, line 7: «Wasps chew wood fibres with spit into paper and build nests of six-sided cells; the paper layers trap air and keep the nest warm, and wasps have done this for…», reached through the same lesson line as the sentence the question matched. What matched: the same action «chew» (+3); the same thing acted on «wood fibres» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/e2/)

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### Exam question 3 · formal language · wrong ✗ {#e3}

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Select the response consistent with the established facts concerning the sleeping arrangements of chimpanzees.

- **1.** No resting place of any description is prepared — **← Mova's choice** · no support
- **2.** The same cave is occupied throughout the year by the whole family group — no support
- **3.** A fresh nest of bent branches is constructed in the trees on each night — **✓ the right answer** · no support
- **4.** The animals repose upon the bare ground in a heap — 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/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/e3/)

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

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Ascertain the reason for which a hummingbird's nest is able to accommodate the growth of the chicks.

- **1.** The parents enlarge it each morning with additional stones from the river bank — no support
- **2.** The chicks vacate it within hours of hatching — no support
- **3.** It is constructed of rigid mud which is rebuilt daily — **← Mova's choice** · score 6
- **4.** It is bound with spider silk, which stretches as the chicks increase in size — **✓ the right answer** · score 6

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**Why:** It took the question to ask which statement is true. It chose option 3 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 243, line 12: «Swallows and house martins build cup nests from mud mixed with spit, and a house martin nest takes about 1,000 mud pellets.», reached through the option's own match among the sentences about the question's things. What matched: the same action «build» (+4); the same thing acted on «cup nests» (+1); the same circumstance (+1). The right option, 4, scored 6. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/245-more-builders-caddis-cases-paper-wasps-moles-apes-beds-and-sand-circles/e4/)

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- ← previous: [244. Animal builders: spiders' webs and silk](https://md.mova.elamur.ai/free/en/school-run/biology/244-animal-builders-spiders-webs-and-silk/)
- next →: [246. Defences: venom in snakes, jellyfish, scorpions…](https://md.mova.elamur.ai/free/en/school-run/biology/246-defences-venom-in-snakes-jellyfish-scorpions-and-the-platypus/)
- ↑ back to [Biology](https://md.mova.elamur.ai/free/en/school-run/biology/)