--- title: Sleep and hibernation — how Mova does on the tests · Biology description: Lesson 55 of the biology course of Mova's primary school: 10 of 12 tests right, exam 1 of 4, every question with the options, the student's choice, the right answer and why it chose. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/school-run/biology/55-sleep-and-hibernation/) [home](https://md.mova.elamur.ai/free/en/) / [at school](https://md.mova.elamur.ai/free/en/school-run/) / [Biology](https://md.mova.elamur.ai/free/en/school-run/biology/) / 55 # Sleep and hibernation **Tests:** 10 of 12 right · **Exam:** 1 of 4 right · **Kind:** ★ · **Understood:** 10 of 16 · **Run:** 2026-10-18, commit `f3c23ea72` Lesson 55 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/55-sleep-and-hibernation/). 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/55-sleep-and-hibernation/). ### Test 1 · ★ · right ✓ {#t1} cartoon bear snores all winter then wakes up fresh as anything. legit? - **1.** Yes, and they eat every day in the den from a store of fish they hid — no support - **2.** Not quite, bears sleep lightly and wake up thin and hungry — **← Mova's choice** · **✓ the right answer** · score 9 - **3.** No, bears never sleep in winter — score 7 - **4.** Yes, they wake up fatter than before — no support **Why:** It took the question to ask which statement is true. It chose option 2 with score 9, against 7 for the next best. Its support: lesson 55, line 5: «Cartoons show bears snoring all winter and waking up in spring with a big stretch, and goldfish forgetting everything in 3 seconds; real bears sleep more light…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «real bears» (+5); the same action «sleep» (+4); the same property (+2). Against it: one says «not», the other does not (counts against) (-2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t1/) ### Test 2 · ★ · right ✓ {#t2} my brother reckons goldfish forget everything in 3 seconds. true? - **1.** No, they forget everything in 3 days — score 9 - **2.** Yes, so they never get bored going round the bowl — no support - **3.** No, that is a myth, goldfish can remember for months — **← Mova's choice** · **✓ the right answer** · score 11 - **4.** Yes, but only at night — no support **Why:** It took the question to ask which statement is true. It chose option 3 with score 11, against 9 for the next best. Its support: lesson 55, line 5: «Cartoons show bears snoring all winter and waking up in spring with a big stretch, and goldfish forgetting everything in 3 seconds; real bears sleep more light…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «goldfish» (+5); the same action «remember» (+4); the same property (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t2/) ### Test 3 · ★ · right ✓ {#t3} Why should you never disturb a hibernating hedgehog? - **1.** It will bite you with poison — no support - **2.** It will roll away and get lost — no support - **3.** It will stay awake for ever and never be able to sleep again — score 4 - **4.** Waking up burns its fat store, which it needs to last the winter — **← Mova's choice** · **✓ the right answer** · score 5 **Why:** It took the question to ask why something happens (its cause). It chose option 4 with score 5, against 4 for the next best. Its support: lesson 55, line 18: «Waking up from hibernation burns a lot of stored fat that has to last the winter, and there is no food to replace it, so hibernating hedgehogs, bats and tortoi…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «waking» (+4); the same action «burn» (+3). Against it: a different thing acted on (counts against) (-2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t3/) ### Test 4 · ★ · right ✓ {#t4} Why should a bonfire pile be checked before it is lit in November? - **1.** A hedgehog may be hibernating inside — **← Mova's choice** · **✓ the right answer** · score 4 - **2.** The leaves might be too wet — no support - **3.** Hedgehogs light bonfires — no support - **4.** Bats hibernate only in bonfire piles — no support **Why:** It took the question to ask why something happens (its cause). It chose option 1 with score 4, the only option with support. Its support: lesson 55, line 6: «Hedgehogs hibernate from about November to March, when there are few beetles, worms or slugs to eat; the heartbeat drops from about 190 to around 20 beats a mi…», reached through the option's own match among the sentences about the question's things. What matched: the same action «hibernate» (+2); the same doer «hedgehogs» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t4/) ### Test 5 · ★ · wrong ✗ {#t5} How can a mother bear feed her cubs when she has not eaten for months? - **1.** She catches fish in her sleep — **← Mova's choice** · score 7 - **2.** The cubs bring her food — no support - **3.** The cubs do not need food till spring — no support - **4.** She makes milk from her stored fat — **✓ the right answer** · score 7 **Why:** It took the question to ask what something is like. It chose option 1 with score 7, tied with another option at 7 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 55, line 7: «Bears sleep through winter in dens living on their fat; their temperature drops only a little, mothers give birth in the den and make milk for the cubs from th…», reached through the option's own match among the sentences about the question's things. What matched: the same action «sleep» (+4); the same doer «bears» (+3). The right option, 4, scored 7. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t5/) ### Test 6 · ★ · right ✓ {#t6} What would happen to a dolphin if it fell completely asleep underwater? - **1.** It could forget to come up and breathe — **← Mova's choice** · **✓ the right answer** · score 4 - **2.** Nothing, dolphins breathe water — score 4 - **3.** It would grow gills — no support - **4.** It would sink to the bottom and sleep happily — score 4 **Why:** It took the question to ask what happens next. 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 55, line 9: «Dolphins sleep with half their brain at a time and one eye open, so they can still come up to breathe and watch for danger.», reached through the option's own match among the sentences about the question's things. What matched: the same action «breathe» (+2); the same doer «dolphins» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t6/) ### Test 7 · ★ · right ✓ {#t7} Why might an animal that eats poor food sleep longer? - **1.** Its food gives little energy, so it saves energy by resting — **← Mova's choice** · **✓ the right answer** · no support - **2.** It is waiting for better food to fall from the sky into its nest — no support - **3.** Poor food makes animals sleepy because of sugar — no support - **4.** It is too sad to stay awake — 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t7/) ### Test 8 · ★ · right ✓ {#t8} why the hell is the bat flapping around in winter? mum woke it moving boxes in the loft - **1.** Bats like to be woken up for a bit of exercise now and then — no support - **2.** It's fine, bats eat snow in winter — no support - **3.** Waking in winter wastes fat it needs, so roosts must be left alone — **← Mova's choice** · **✓ the right answer** · score 7 - **4.** It's not a bat, bats are blind — score 3 **Why:** It took the question to ask which statement is true. It chose option 3 with score 7, against 3 for the next best. Its support: lesson 55, line 18: «Waking up from hibernation burns a lot of stored fat that has to last the winter, and there is no food to replace it, so hibernating hedgehogs, bats and tortoi…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «stored fat» (+5); the same thing acted on «stored fat» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t8/) ### Test 9 · ★ · right ✓ {#t9} A wood frog froze solid in winter and its heart stopped. What happens in spring? - **1.** It only comes back if someone warms it in their hands — no support - **2.** It stays frozen for ever — score 3 - **3.** It turns into a tadpole again — score 3 - **4.** It thaws and hops away — **← Mova's choice** · **✓ the right answer** · score 9 **Why:** It took the question to ask which statement is true. It chose option 4 with score 9, against 3 for the next best. Its support: lesson 32, line 16: «The wood frog lets about two thirds of the water in its body freeze; its heart stops, and sugar works as antifreeze inside its cells until it thaws in spring;…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «heart» (+5); the same action «thaw» (+4). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t9/) ### Test 10 · ★ · right ✓ {#t10} Why does staring at a bright screen before bed make it harder to fall asleep? - **1.** Screens use up all of the brain's memory — no support - **2.** It doesn't, screens help you sleep better — no support - **3.** Bright light tells the brain it is still daytime — **← Mova's choice** · **✓ the right answer** · score 2 - **4.** Screens make your eyes too heavy — no support **Why:** It took the question to ask why something happens (its cause). It chose option 3 with score 2, the only option with support. Its support: lesson 55, line 15: «Children of 9 to 10 need about 9 to 12 hours of sleep a night; during sleep the body grows and repairs itself, and the brain sorts memories; bright light from…», reached through the option's own match among the sentences about the question's things. What matched: the same action «tell» (+2); the same thing acted on «brain» (+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/biology/55-sleep-and-hibernation/t10/) ### Test 11 · ★ · wrong ✗ {#t11} How is sleeping through summer heat like hibernating through winter cold? - **1.** Both happen only in the Arctic — **← Mova's choice** · no support - **2.** Neither has anything to do with food, they are only about the weather — no support - **3.** Both help an animal live through a time without food or water — **✓ the right answer** · no support - **4.** Both make the animal grow faster — 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t11/) ### Test 12 · ★ · right ✓ {#t12} Why is a warm house dangerous for a tortoise that ought to be hibernating? - **1.** It may wake and burn its energy with no food to eat — **← Mova's choice** · **✓ the right answer** · no support - **2.** Tortoises catch colds from radiators and hot water pipes — no support - **3.** Warm air dries its shell into dust — no support - **4.** It is not dangerous at all — 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/t12/) ### Exam question 1 · formal language · wrong ✗ {#e1} Identify the principal physiological change observed in the hedgehog during hibernation. - **1.** An increase in heart rate to generate heat against the cold — **← Mova's choice** · no support - **2.** The growth of a thicker coat of spines — no support - **3.** A cessation of all cardiac activity — no support - **4.** A marked reduction in heart rate and body temperature — **✓ 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/e1/) ### Exam question 2 · formal language · wrong ✗ {#e2} Which of the following statements most accurately characterises the sleep of the dolphin? - **1.** Both halves of the brain rest simultaneously upon the seabed — no support - **2.** The dolphin does not sleep at any point — **← Mova's choice** · score 10 - **3.** The dolphin sleeps exclusively upon the shore — score 10 - **4.** One half of the brain rests while the other remains alert — **✓ the right answer** · no support **Why:** It took the question to ask who or what does it. 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 27, line 8: «Dolphins sleep with half of their brain at a time, switching sides, so they can keep coming up to breathe.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+5); the same doer «dolphins» (+4); 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/e2/) ### Exam question 3 · formal language · right ✓ {#e3} Select the response consistent with the established facts concerning the nightly sleep requirement of a child aged nine or ten years. - **1.** Approximately nine to twelve hours — **← Mova's choice** · **✓ the right answer** · no support - **2.** Approximately four to five hours — no support - **3.** Approximately fifteen to eighteen hours — no support - **4.** No sleep is required at that age — 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/e3/) ### Exam question 4 · formal language · wrong ✗ {#e4} Ascertain the term applied to a period of dormancy undertaken during a hot and arid season. - **1.** Migration — **← Mova's choice** · no support - **2.** Hibernation — no support - **3.** Metamorphosis — no support - **4.** Aestivation — **✓ 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/55-sleep-and-hibernation/e4/) - ← previous: [54. Migration: the great journeys](https://md.mova.elamur.ai/free/en/school-run/biology/54-migration-the-great-journeys/) - next →: [56. How plants grow: seeds, light, water and air](https://md.mova.elamur.ai/free/en/school-run/biology/56-how-plants-grow/) - ↑ back to [Biology](https://md.mova.elamur.ai/free/en/school-run/biology/)