---
title: Sleep, exercise and growing up — how Mova does on the tests · World
description: Lesson 38 of the world course of Mova's primary school: 3 of 13 tests right, exam 2 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

<!-- md -->
[Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/school-run/world/38-sleep-exercise-growing/)

<!-- crumbs -->
[home](https://md.mova.elamur.ai/free/en/) / [at school](https://md.mova.elamur.ai/free/en/school-run/) / [World](https://md.mova.elamur.ai/free/en/school-run/world/) / 38

# Sleep, exercise and growing up

<!-- .vintro -->
**Tests:** 3 of 13 right · **Exam:** 2 of 4 right · **Kind:** ★★ · **Understood:** 7 of 17 · **Run:** 2026-10-18, commit `f3c23ea72`

<!-- .vabout -->
Lesson 38 of the world 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/world/38-sleep-exercise-growing/).

<!-- .vabout -->
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/world/38-sleep-exercise-growing/).

<!-- div qa no -->

### Test 1 · ★★ · wrong ✗ {#t1}

<!-- .q -->
Mia stayed up late playing games and slept only 6 hours before a test. What is most likely?

- **1.** Sleep has nothing at all to do with how well you do in tests — **← Mova's choice** · no support
- **2.** She will grow taller that day — no support
- **3.** She will remember more than usual — no support
- **4.** She will find it harder to think and remember — **✓ the right answer** · no support

<!-- .why -->
**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/world/38-sleep-exercise-growing/t1/)

<!-- /div -->

<!-- div qa no -->

### Test 2 · ★★ · wrong ✗ {#t2}

<!-- .q -->
A boy broke his leg and had it in a cast for six weeks. Afterwards that leg looks thinner. Why?

- **1.** Its unused muscles got weaker — **✓ the right answer** · no support
- **2.** The other leg grew too fast meanwhile — **← Mova's choice** · score 5
- **3.** The blood left that leg forever — no support
- **4.** The cast squeezed the bone shorter — no support

<!-- .why -->
**Why:** It took the question to ask why something happens (its cause). It chose option 2 with score 5, the only option with support. Its support: lesson 25, line 2: «A frog starts as an egg in a pond, hatches into a tadpole that swims and breathes with gills, then grows legs, loses its tail and becomes a frog that can live…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «legs» (+3); the same action «grow» (+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/world/38-sleep-exercise-growing/t2/)

<!-- /div -->

<!-- div qa no -->

### Test 3 · ★★ · wrong ✗ {#t3}

<!-- .q -->
Why would an astronaut back from six months in space find walking hard at first?

- **1.** They forgot how to walk in their brain — **← Mova's choice** · no support
- **2.** Earth has less gravity than space — no support
- **3.** Their legs got longer in space — no support
- **4.** Their muscles and bones weakened without weight to carry — **✓ the right answer** · no support

<!-- .why -->
**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/world/38-sleep-exercise-growing/t3/)

<!-- /div -->

<!-- div qa ok -->

### Test 4 · ★★ · right ✓ {#t4}

<!-- .q -->
A girl wants a stronger heart for running. What should she do?

- **1.** Rest all day to save the heart — score 5
- **2.** Run and play actively often, a little more each week — **← Mova's choice** · **✓ the right answer** · score 10
- **3.** Eat lots of sugar before every run — no support
- **4.** Run as fast as possible once a year — score 10

<!-- .why -->
**Why:** It took the question to ask what is done. It chose option 2 with score 10, tied with another option at 10 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 32, line 15: «When you run, your working muscles need more oxygen, so your heart beats faster and you breathe faster.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same action «run» (+4). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/38-sleep-exercise-growing/t4/)

<!-- /div -->

<!-- div qa no -->

### Test 5 · ★★ · wrong ✗ {#t5}

<!-- .q -->
Which bedtime habit helps sleep most?

- **1.** Drinking a big cola before bed — **← Mova's choice** · no support
- **2.** Going to bed at a new time every night of the week — no support
- **3.** Putting screens away and keeping the room dark — **✓ the right answer** · no support
- **4.** Watching a bright tablet in bed — no support

<!-- .why -->
**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/world/38-sleep-exercise-growing/t5/)

<!-- /div -->

<!-- div qa no -->

### Test 6 · ★★ · wrong ✗ {#t6}

<!-- .q -->
Two runners: one warms up, one does not. Who is more likely to get hurt?

- **1.** Neither, warming up is only for cold days — **← Mova's choice** · no support
- **2.** Both are equally likely in every case — no support
- **3.** The one who did not warm up — **✓ the right answer** · no support
- **4.** The one who warmed up — no support

<!-- .why -->
**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/world/38-sleep-exercise-growing/t6/)

<!-- /div -->

<!-- div qa no -->

### Test 7 · ★★ · wrong ✗ {#t7}

<!-- .q -->
Which is true?

- **1.** Bones never change after birth — **← Mova's choice** · no support
- **2.** Both muscles and bones get stronger when they are used — **✓ the right answer** · no support
- **3.** Exercise makes bones weaker — no support
- **4.** Only the muscles in the arms can get stronger, never bones or legs — no support

<!-- .why -->
**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/38-sleep-exercise-growing/t7/)

<!-- /div -->

<!-- div qa no -->

### Test 8 · ★★ · wrong ✗ {#t8}

<!-- .q -->
A 12-year-old is shorter than his classmates. What is most likely?

- **1.** He sleeps too much — **← Mova's choice** · no support
- **2.** He grows at his own pace and may catch up later — **✓ the right answer** · no support
- **3.** He has the wrong number of bones — no support
- **4.** He will never grow again — no support

<!-- .why -->
**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/38-sleep-exercise-growing/t8/)

<!-- /div -->

<!-- div qa no -->

### Test 9 · ★★ · wrong ✗ {#t9}

<!-- .q -->
If a child slept only four hours a night for many weeks, what might happen?

- **1.** They would learn twice as fast — no support
- **2.** Nothing at all, because sleep is not really needed — no support
- **3.** Growth, learning and health could suffer — **✓ the right answer** · no support
- **4.** They would grow much faster — **← Mova's choice** · score 2

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 4 with score 2, the only option with support. Its support: lesson 38, line 14: «Children grow fastest as babies and again during puberty.», reached through the option's own match among the sentences about the question's things. What matched: the same action «grow» (+1); the same property (+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/world/38-sleep-exercise-growing/t9/)

<!-- /div -->

<!-- div qa no -->

### Test 10 · ★★ · wrong ✗ {#t10}

<!-- .q -->
why'd astronauts bother working out up in space

- **1.** So they stay warm in the freezing cold of space — no support
- **2.** So their muscles and bones stay strong — **✓ the right answer** · no support
- **3.** Because there is nothing else to do up there — no support
- **4.** So they float the right way up in the cabin — **← Mova's choice** · score 2

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 4 with score 2, the only option with support. Its support: lesson 6, line 18: «Gravity works in space too; astronauts float because they are falling around the Earth together with their ship.», reached through the option's own match among the sentences about the question's things. What matched: the same action «float» (+1); the same doer «astronauts» (+1). 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/world/38-sleep-exercise-growing/t10/)

<!-- /div -->

<!-- div qa no -->

### Test 11 · ★★ · wrong ✗ {#t11}

<!-- .q -->
phone in bed till late n then can't sleep, how come

- **1.** Late nights make you grow too fast to sleep properly — **← Mova's choice** · no support
- **2.** Bright screen light makes it harder to fall asleep — **✓ the right answer** · no support
- **3.** Phones make the bed too warm — no support
- **4.** The phone uses up your sleep — no support

<!-- .why -->
**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/world/38-sleep-exercise-growing/t11/)

<!-- /div -->

<!-- div qa ok -->

### Test 12 · ★★ · right ✓ {#t12}

<!-- .q -->
my brother says sleep is just wasted time, nothing happens. true?

- **1.** No, sleep makes muscles weaker — no support
- **2.** No, the body repairs itself and the brain stores what it learned — **← Mova's choice** · **✓ the right answer** · score 8
- **3.** Yes, only dreams happen in sleep — no support
- **4.** Yes, the body switches off fully — no support

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 2 with score 8, the only option with support. Its support: lesson 38, line 1: «Sleep is not wasted time. While you sleep the body releases growth hormone and repairs itself, and the brain sorts and stores what you learned during the day.», reached through the same lesson line as the sentence the question matched. What matched: the same action «store» (+4); the same doer «brain» (+4). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/38-sleep-exercise-growing/t12/)

<!-- /div -->

<!-- div qa ok -->

### Test 13 · ★★ · right ✓ {#t13}

<!-- .q -->
Zoe reckons everyone the same age should be the same height. right?

- **1.** No, everyone grows at their own pace — **← Mova's choice** · **✓ the right answer** · score 4
- **2.** Yes, the same age means the same height — no support
- **3.** No, older children are always shorter — no support
- **4.** Yes, unless they eat sweets — no support

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 1 with score 4, the only option with support. Its support: lesson 38, line 16: «Everyone grows at their own pace.», reached through the option's own match among the sentences about the question's things. What matched: the same circumstance (+2); the same action «grow» (+1); the same doer «everyone» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/38-sleep-exercise-growing/t13/)

<!-- /div -->

<!-- div qa no -->

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

<!-- .q -->
Select the response that is consistent with the established facts concerning the functions of sleep.

- **1.** Growth occurs solely during waking hours — **← Mova's choice** · no support
- **2.** The body repairs itself and the brain consolidates learning — **✓ the right answer** · no support
- **3.** Memory is erased during sleep — no support
- **4.** The body ceases all activity until waking — no support

<!-- .why -->
**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/world/38-sleep-exercise-growing/e1/)

<!-- /div -->

<!-- div qa no -->

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

<!-- .q -->
State the quantity of sleep recommended nightly for children aged six to twelve years.

- **1.** Approximately five to six hours — **← Mova's choice** · no support
- **2.** Approximately fifteen to eighteen hours — no support
- **3.** Approximately three to four hours — no support
- **4.** Approximately nine to twelve hours — **✓ the right answer** · no support

<!-- .why -->
**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/world/38-sleep-exercise-growing/e2/)

<!-- /div -->

<!-- div qa ok -->

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

<!-- .q -->
Identify the principal reason for which astronauts exercise daily in space.

- **1.** To preserve the strength of their muscles and bones — **← Mova's choice** · **✓ the right answer** · no support
- **2.** To increase their weight — no support
- **3.** To generate warmth within the vessel during the night — no support
- **4.** To propel the vessel through space — no support

<!-- .why -->
**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/world/38-sleep-exercise-growing/e3/)

<!-- /div -->

<!-- div qa ok -->

### Exam question 4 · formal language · right ✓ {#e4}

<!-- .q -->
Determine the consequence for a muscle that is not exercised.

- **1.** It becomes bone — no support
- **2.** It becomes stronger — no support
- **3.** It is unaltered — no support
- **4.** It becomes weaker — **← Mova's choice** · **✓ the right answer** · score 4

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 4 with score 4, the only option with support. Its support: lesson 38, line 12: «Muscles that are not used become weaker.», reached through the same lesson line as the sentence the question matched. What matched: the same action «become» (+4); the same property (+1). Against it: 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/world/38-sleep-exercise-growing/e4/)

<!-- /div -->

<!-- pn -->
- ← previous: [37. Germs, hygiene and vaccines](https://md.mova.elamur.ai/free/en/school-run/world/37-germs-hygiene-vaccines/)
- next →: [39. First aid and safety](https://md.mova.elamur.ai/free/en/school-run/world/39-first-aid-and-safety/)
- ↑ back to [World](https://md.mova.elamur.ai/free/en/school-run/world/)